Variants and compositions comprising variants with high stability in presence of a chelating agent

ABSTRACT

The present invention relates to variants of an alpha-amylase having improved stability to chelating agents relative to its parent enzyme, compositions comprising the variants, nucleic acids encoding the variants, methods of producing the variants, and methods for using the variants.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/834,010, which is a continuation of U.S. application Ser. No.16/362,955 filed Mar. 25, 2019, now U.S. Pat. No. 10,655,116, which is acontinuation of U.S. application Ser. No. 15/708,669 filed Sep. 19,2017, U.S. Pat. No. 10,240,135, which claims priority or the benefitunder 35 U.S.C. 1120 of U.S. application Ser. No. 13/024,770 filed Feb.10, 2011, now U.S. Pat. No. 9,896,673, which claims priority or thebenefit under 35 U.S.C. 119 of European application no. 10153180.4 filedFeb. 10, 2010 and U.S. provisional application No. 61/303,345 filed Feb.11, 2010, the contents of which are fully incorporated herein byreference.

REFERENCE TO A SEQUENCE LISTING

This application contains a Sequence Listing in computer readable form.The computer readable form is incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to variants of an alpha-amylase havingimproved stability to chelating agents relative to its parent enzyme,compositions comprising the variants, nucleic acids encoding thevariants, methods of producing the variants, and methods for using thevariants.

BACKGROUND OF THE INVENTION

Alpha-amylases (alpha-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1)constitute a group of enzymes, which catalyses hydrolysis of starch andother linear and branched 1,4-gluosidic oligo- and polysaccharides.

There is a long history of industrial application of alpha-amylases ine.g. detergent, baking, brewing, starch liquefaction andsaccharification such as in preparation of high fructose syrups or aspart of ethanol production from starch. Many of these and otherapplications of alpha-amylases utilize alpha-amylases derived frommicroorganisms, in particular bacterial alpha-amylases.

Among the first bacterial alpha-amylases to be used were analpha-amylase from B. licheniformis, also known as Termamyl, which hasbeen extensively characterized and the crystal structure has beendetermined for this enzyme. Alkaline amylases, such as the alpha-amylasederived from Bacillus sp. as disclosed in WO 95/26397, form a particulargroup of alpha-amylases that have found use in detergents. Many of theseknown bacterial amylases have been modified in order to improve theirfunctionality in a particular application.

Termamyl and many highly efficient alpha-amylases required calcium foractivity. The crystal structure for Termamyl was found that four calciumatoms were bound in the alpha-amylase structure coordinated bynegatively charged amino acid residues. In other alpha-amylases theamount of calcium ions bound in the structure might be different. Thisrequirement for calcium is a disadvantage in applications where strongchelating compounds are present, such as in detergents or during ethanolproduction from whole grains.

As mentioned above it is well known that a number of enzymes aredependent on calcium or other metal ions such as magnesium or zinc forboth activity and stability, hence it is a challenge to develop enzymeswhich are both stable and show good performance in compositionscomprising a chelating agent, e.g. detergents containing chelatingagents or compositions for use in the production of biofuel wherein theplant material or the starch-containing material has a natural contentof chelating agents such as e.g. phytic acid. Chelating agents are e.g.added or incorporated to reduce the water hardness during wash, protectbleaching agents that may also be present, and chelating agents alsohave a direct effect on the removal of some stains. The stability of acalcium dependent enzyme in a detergent can sometimes be improved byaddition of calcium to the detergent, but often this will then destroythe stain removing effect. Furthermore, addition of calcium to a liquiddetergent may present problems with the formulation, i.e. the physicalstability of the detergent.

SUMMARY OF THE INVENTION

It would therefore be beneficial to provide compositions and variants ofalpha-amylases which are stable towards chelating agents and whichpreferably have retained or increased wash performance compared to theparent alpha-amylase.

Thus a first aspect of the invention relates to a composition comprisinga variant of a parent alpha-amylase, wherein the variant comprises asubstitution at one or more positions selected from the group consistingof 195, 193, 197, 198, 200, 203, 206, 210, 212, 213 and 243, using thenumbering according to SEQ ID NO: 6, and further comprising at least onechelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0.

Another aspect relates to a composition comprising a variant of a parentalpha-amylase, wherein the variant comprises a substitution at one ormore positions selected from the group comprising 195, 193, 197, 198,200, 203, 206, 210, 212, 213 and 243, using the numbering according toSEQ ID NO:6, and further comprising at least one chelating agent whereinsaid chelating agent is capable of reducing the free calcium ionconcentration from 2.0 mM to 0.10 mM at a chelating agent concentrationless than 0.9 times the concentration of citrate capable of reducing thefree calcium ion concentration from 2.0 mM to 0.10 mM, when measured at21° C. and pH 8.0.

The invention further relates to a method for preparing a polypeptidecomprising:

-   -   (a) providing an amino acid sequence of a parent polypeptide        having amylase activity;    -   (b) selecting one or more amino acids occupying one or more        positions corresponding to positions 195, 197, 198, 200, 203,        206, 210, 212, 213, 243 and further selecting one or more        position corresponding to positions 116, 118, 129, 133, 142,        146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339,        359, 418, 431, 434, 447, 458 of the mature polypeptide of SEQ ID        NO:6;    -   (c) modifying the sequence by substituting or deleting the        selected amino acid residue or inserting one or more amino acid        residues adjacent to the selected amino acid residue;    -   (d) producing a variant polypeptide having the modified        sequence;    -   (e) testing the variant polypeptide for amylase activity and        stability; and    -   (f) selecting a variant polypeptide having amylase activity and        increased stability relative to the parent polypeptide in the        presence of a chelating agent wherein said chelating agent at a        concentration below 10 mM is capable of reducing the        concentration of free calcium ions from 2.0 mM to 0.10 mM at        21° C. and pH 8.0.

In a preferred aspect the invention relates to a variant of a parentalpha-amylase comprising an alteration at one or more positionscorresponding to positions selected from the group consisting of 195,197, 198, 200, 203, 206, 210, 212, 213 and 243 and further comprising analteration at one or more positions corresponding to positions selectedfrom the group consisting of 116, 118, 129, 133, 142, 146, 147, 149,151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434,447 and 458 wherein

(a) the alteration(s) are independently

-   -   (i) an insertion of an amino acid immediately downstream and        adjacent of the position,    -   (ii) a deletion of the amino acid which occupies the position,        and/or    -   (iii) a substitution of the amino acid which occupies the        position,        (b) the variant has alpha-amylase activity; and        (c) each position corresponds to a position of the amino acid        sequence of the enzyme having the amino acid sequence of SEQ ID        NO: 6.

In another aspect the invention relates to a variant of a parentalpha-amylase comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprising an alteration at one or more positions selected from thegroup consisting of 195, 197, 198, 200, 203, 206, 210, 212, 213 and 243and further comprising an alteration at one or more positions selectedfrom the group consisting of 116, 118, 129, 133, 142, 146, 147, 149,151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434,447 and 458 wherein

(a) the alteration(s) are independently

-   -   (i) an insertion of an amino acid immediately downstream and        adjacent of the position,    -   (ii) a deletion of the amino acid which occupies the position,        and/or    -   (iii) a substitution of the amino acid which occupies the        position,        (b) the variant has alpha-amylase activity; and        (c) each position corresponds to a position of the amino acid        sequence of the enzyme having the amino acid sequence of SEQ ID        NO: 6.

The invention further relates to an isolated nucleotide sequenceencoding the variant of the invention and recombinant host cellcomprising the nucleotide sequence encoding the variants according tothe invention.

DETAILED DESCRIPTION OF THE INVENTION Definitions

Alpha-Amylases (alpha-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1)constitute a group of enzymes, which catalyze hydrolysis of starch andother linear and branched 1,4-glucosidic oligo- and polysaccharides.Alpha-amylases are known derived from a wide selection of organismsincluding Bacteria, such as from species of the genus Bacillus e.g.Bacillus licheniformis; from species of fungi, such as Aspergillusoryzae (TAKA-amylase) or Aspergillus niger; from plants such as barleyand from mammals.

Wild-Type Enzyme: The term “wild-type” alpha-amylase denotes analpha-amylase expressed by a naturally occurring microorganism, such asa bacterium, yeast or filamentous fungus found in nature. The terms“wild-type enzyme” and “parent enzyme” can be used interchangeably whenthe parent enzyme is not a variant enzyme.

Variant Enzyme: The term “variant” is defined herein as a polypeptidehaving alpha-amylase activity comprising an alteration, such as asubstitution, insertion, and/or deletion, of one or more (or one orseveral) amino acid residues at one or more (or one or several) specificpositions of the parent or wild type alpha-amylase. Preferably less than50 modifications, more preferred less than 30 modifications. The alteredalpha-amylase is obtained through human intervention by modification ofthe parent alpha-amylase.

Parent Enzyme: The term “parent” alpha-amylase as used herein means analpha-amylase to which modifications are made to produce the variantalpha-amylases of the present invention. This term also refers to thepolypeptide with which a variant of the invention is compared. Theparent may be a naturally occurring (wild type) polypeptide, or it mayeven be a variant thereof, prepared by any suitable means. For instance,the parent protein may be a variant of a naturally occurring polypeptidewhich has been modified or altered in the amino acid sequence. Thus theparent alpha-amylase may have one or more (or one or several) amino acidsubstitutions, deletions and/or insertions. Thus the parentalpha-amylase may be a variant of a parent alpha-amylase. A parent mayalso be an allelic variant which is a polypeptide encoded by any of twoor more alternative forms of a gene occupying the same chromosomallocus.

Improved property: The term “improved property” is defined herein as acharacteristic associated with a variant that is improved compared tothe parent alpha-amylase. Such improved properties include, but are notlimited to, increased amylolytic activity e.g. when measured in EnzChekassay or the PNP-G7 assay as described in Examples section herein,increased wash performance such as soil performance e.g. performance tostarch containing soils, stain removal, anti-greying, stability e.g.thermostability, pH stability, or stability in the presence of builders,incl. chelants, stability in powder, liquid or gel detergentformulations or dishwashing compositions, altered temperature-dependentperformance and activity profile, pH activity, substrate specificity,product specificity, and chemical stability. Wash performance and/ordish wash performance may be measured as described below under“Materials and Methods” in the present application. Preferably thevariants of the invention include a combination of improved propertiessuch as improved stability, improved wash performance, improved dishwash performance and/or improved activity in detergent. Improvedstability includes both stability during storage in a concentrateddetergent product and stability in the diluted detergent during wash.The improved property includes improved wash or dish wash performance atlow temperature.

Activity: In the present context the term “activity” is the amylolyticactivity measured by the number of 1,4-alpha-D-glycosidic linkageshydrolysed in polysaccharides containing three or more 1,4-alpha-linkedD-glucose units as e.g. in starch per unit of time and per unit ofenzyme protein at specified conditions, e.g. the activity obtained atspecified conditions per mL of an enzyme sample of g of an enzymeprotein. The activity can be measured in e.g. EnzChek assay or a PNP-G7assay as described below under “Material and Methods”. In the presentapplication the term “activity” is used interchangeably with “amylolyticactivity”. The term “specific activity” is often used to describe themaximal activity obtained per mL (or g) of an enzyme protein.

Improved chemical stability: The term “improved chemical stability” isdefined herein as a variant enzyme displaying retention of enzymaticactivity after a period of incubation in the presence of a chemical orchemicals, either naturally occurring or synthetic, which reduces theenzymatic activity of the parent enzyme. Improved chemical stability mayalso result in variants better able to catalyze a reaction in thepresence of such chemicals. In a particular aspect of the invention theimproved chemical stability is an improved stability in a detergent, inparticular in a liquid detergent. The improved detergent stability is inparticular an improved stability of the alpha-amylase activity when analpha-amylase variant of the present invention is mixed into a liquiddetergent formulation comprising a chelating agent, the liquid alsoincludes gels or a paste. The liquid detergent formulation may refer toconcentrated detergent which is added during a laundry or automated dishwash process or a dilute detergent such as a wash solution, i.e. anaqueous solution to which the concentrated detergent is added.

In the present invention liquid detergents are particular useful asliquid laundry detergents.

Stability: The term “stability” includes storage stability and stabilityduring use, e.g. during a wash process or another industrial process,and reflects the stability of the amylase as a function of time e.g. howmuch activity is retained when the amylase is kept in solution inparticular in a detergent solution. For example, the alpha-amylasevariant may have a residual activity, i.e. how much activity isretained, above 70% after 18 hours at 31° C. The stability is influencedby many factors e.g. pH, temperature, detergent composition e.g. amountand type of builder, surfactants etc. The amylase stability is measuredusing either the EnzCheck assay or the PNP-G7 assay described in under“Materials and Methods”.

Improved stability: The term “improved stability” is defined herein as avariant enzyme displaying an increased stability which is higher thanthe stability of the parent alpha-amylase, e.g. by having a residualactivity above 70% or having at least 10 pp improvement in residualactivity relative to parent after 18 hours at pH 8 in the presence of1.5% (w/v) DTPA at 31° C. when measured in the EnzCheck assay asdescribed under “Materials and Methods”. The percentage point (pp)improvement in residual activity of the variant relative to the parentis calculated as the difference between the residual activity of thevariant and that of the parent as described under “Materials andMethods”.

Builder: Builders may be classified by the test described by M. K.Nagarajan et al., JAOCS, Vol. 61, no. 9 (September 1984), pp. 1475-1478to determine the minimum builder level required to lower the waterhardness at pH 8 from 2.0 mM (as CaCO₃) to 0.10 mM in a solution. Thebuilder may particularly be chelating agent that forms water-solublecomplexes with e.g. calcium and magnesium ions.

Chelating agents or chelators are chemicals which form molecules withcertain metal ions, inactivating the ions so that they cannot react withother elements thus a binding agent that sup-presses chemical activityby forming chelates. Chelation is the formation or presence of two ormore separate bindings between a ligand and a single central atom. Theligand may be any organic compound, a silicate or a phosphate. In thepresent context the term “chelating agents” comprises chelants,chelating agent, chelating agents, complexing agents, or sequesteringagents that forms water-soluble complexes with metal ions such ascalcium and magnesium. The chelate effect describes the enhancedaffinity of chelating ligands for a metal ion compared to the affinityof a collection of similar nonchelating ligands for the same metal.Chelating agents having binding capacity with metal ions, in particularcalcium (Ca²⁺) ions, and has been used widely in detergents andcompositions in general for wash, such as laundry or dish wash.Chelating agents have however shown themselves to inhibit enzymaticactivity. The term chelating agent is used in the present applicationinterchangeably with “complexing agent” or “chelating agent” or“chelant”.

Since most alpha-amylases are calcium sensitive the presence ofchelating agents these may impair the enzyme activity. The calciumsensitivity of alpha-amylases can be determined by incubating a givenalpha-amylase in the presence of a strong chelating agent and analyzethe impact of this incubation on the activity of the alpha-amylase inquestion. A calcium sensitive alpha-amylase will lose a major part orall of its activity during the incubation.

Characterizing chelating agents: As mentioned the chelate effect or thechelating effect describes the enhanced affinity of chelating ligandsfor a metal ion compared to the affinity of a collection of similarnonchelating ligands for the same metal. However, the strength of thischelate effect can be determined by various types of assays or measuremethods thereby differentiating or ranking the chelating agentsaccording to their chelating effect (or strength).

In a preferred assay the chelating agents may be characterized by theirability to reduce the concentration of free calcium ions (Ca²⁺) from 2.0mM to 0.10 mM or less at pH 8.0, e.g. by using a test based on themethod described by M. K. Nagarajan et al., JAOCS, Vol. 61, no. 9(September 1984), pp. 1475-1478. An example of characterization ofchelating agents using the Nagarajan et. al. based method is describedin example 2a. Preferably, a the chelating agent according to theinvention encompass chelating agents able to reduce the concentration offree calcium ions from 2.0 mM to 0.1 mM or less at a concentration below10 mM, preferably below 9.5 mM, preferably below 9 mM, preferably below8.5 mM, preferably below 8 mM, preferably below 7.5 mM, preferably below7 mM, preferably below 6.5 mM, preferably below 6 mM, preferably below5.5 mM, preferably, preferably below 5 mM, preferably below 4.5 mM,below 4 mM, preferably below 3.5 mM, preferably below 3 mM, preferablybelow 2.5 mM, preferably below 2 mM, preferably below 1.5 mM orpreferably below 1 mM, when measured in pH 8.0 at 21° C.

Preferably, the chelating agent according to the invention encompasseschelating agents able to reduce the concentration of free calcium ionsfrom 2.0 mM to 0.1 mM at a concentration below 10 mM, preferably below9.5 mM, preferably below 9 mM, preferably below 8.5 mM, preferably below8 mM, preferably below 7.5 mM, preferably below 7 mM, preferably below6.5 mM, preferably below 6 mM, preferably below 5.5 mM, preferably,preferably below 5 mM, preferably below 4.5 mM, below 4 mM, preferablybelow 3.5 mM, preferably below 3 mM, preferably below 2.5 mM, preferablybelow 2 mM, preferably below 1.5 mM or preferably below 1 mM, whenmeasured in 80 mM potassium chloride and 49 mM EPPS((4-(2-hydroxyethyl)piperazine-1-propanesulfonic acid)), at pH 8 at 21°C. In a particular preferred embodiment the chelating agent is able toreduce the concentration of free calcium ions from 2.0 mM to 0.1 mM whenmeasured in 80 mM potassium chloride and 49 mM EPPS, at pH 8 and 21° C.and using a calcium ion selective electrode for the determination of thefree calcium concentration, as described under “Materials and Methods”.Thus preferably, the chelating agents encompass chelating agents whichare able to reduce the concentration of free calcium ions from 2.0 mM to0.10 mM at a concentration below 10 mM, preferably below 9.5 mM,preferably below 9.0 mM, preferably below 8.5 mM, preferably below 8.0mM, preferably below 7.5 mM, preferably below 7.0 mM, preferably below6.5 mM, preferably below 6.0 mM, preferably below 5.5 mM, preferably,preferably below 5.0 mM, preferably below 4.5 mM, below 4.0 mM,preferably below 3.5 mM, preferably below 3.0 mM, preferably below 2.5mM, preferably below 2.0 mM, preferably below 1.5 mM or preferably below1.0 mM when tested at pH 8.0 and 21° C., as described under “Materialsand Methods”.

In a particularly preferred embodiment the chelating agents is able toreduce the concentration of free calcium ions from 2.0 mM to 0.10 mMwhen measured in 80 mM potassium chloride and 49 mM EPPS at pH 8 and 21°C. at a concentration of 9 mM to 0.5 mM, preferably 9 mM to 1 mM,preferably 8 mM to 1 mM, preferably 7 mM to 1 mM, preferably 6 mM to 1mM, preferably 5 mM to 1 mM, preferably 4 mM to 1 mM, preferably 3 mM to1 mM, preferably 2 mM to 1 mM, preferably 9.0 mM to 1.5 mM, preferably8.0 mM to 1.5 mM, preferably 7.0 mM to 1.5 mM, preferably 6.0 mM to 1.5mM, preferably 5.0 mM to 1.5 mM, preferably 4.0 mM to 1.5 mM, preferably3.0 to 1.5 mM, preferably 2.5 mM to 1.0 mM, preferably 2.0 mM to 1.1 mM,preferably 1.85 mM to 1.0 mM.

The reduction in free calcium ion concentration from 2.0 mM Ca²⁺ to 0.10mM, corresponds to reducing the water hardness from 200 ppm (as CaCO₃,in the form of Ca(HCO₃)₂ in the presence of acidic CO₂) to 10 ppm. Theminimum builder level is calculated from the sodium salt of the chelantand on a 100% dry chelant basis.

The chelating effect of the chelating agent can also be measuredrelative to citrate. The concentration of the citrate able to reduce theamount of free calcium ion concentration from 2.0 mM to 0.10 mM isassigned the value of 1 and the results of the chelating agents arecompared to this value. The preferred chelating agent according to theinvention is capable of reducing the free calcium concentration from 2.0mM to 0.10 mM at a concentration below 0.9, such as below 0.8, such asbelow 0.7, such as below 0.6, such as below 0.5, such as below 0.4, suchas below 0.3, such as below 0.2, such as below 0.1 times lower comparedto the concentration of citrate, when measured at pH 8.0 and 21° C. Thepreferred chelating agent according to the invention is capable ofreducing the free calcium concentration from 2.0 mM to 0.10 mM at aconcentration below 0.9, such as below 0.8, such as below 0.7, such asbelow 0.6, such as below 0.5, such as below 0.4, such as below 0.3, suchas below 0.2, such as below 0.1 times lower compared to theconcentration of citrate, when measured in pH 8.0 at 21° C. using acalcium ion selective electrode for the determination of the freecalcium concentration when measured in 80 mM potassium chloride and 49mM EPPS at 21° C. and pH 8.0.

In a particularly preferred embodiment the chelating agent is able toreduce the concentration of free calcium ions from 2.0 mM to 0.10 mM ata chelating agent concentration below 1.0 to 0.1, such as below 0.9 to0.1, such as below 0.8 to 0.1, such as below 0.7 to 0.1, such as below0.6 to 0.1, such as below 0.5 to 0.1, such as below 0.4 to 0.1, such asbelow 0.35 to 0.1, such as below 0.3 to 0.1 times lower compared to theconcentration of citrate able to reduce the concentration of freecalcium ions from 2.0 mM to 0.10 mM, when measured at pH 8.0 and 21° C.

Thus a preferred embodiment of the invention concerns a compositioncomprising a variant of a parent alpha-amylase wherein the variantcomprise a substitution at one or more positions in the range 193 to213, using the numbering according to SEQ ID NO: 6, and furthercomprising at least one chelating agent wherein said chelating agent iscapable of reducing the free calcium ion concentration from 2.0 mM to0.10 mM at a chelating agent concentration less than 0.9 times theconcentration of citrate capable of reducing the free calcium ionconcentration from 2.0 mM to 0.10 mM, when measured at 21° C. and pH 8.

A further embodiment of the invention relates to a compositioncomprising a variant of a parent alpha-amylase wherein the variantalpha-amylase comprises a substitution at one or more positions selectedfrom the group consisting of 193, 195, 197, 198, 200, 203, 206, 210, 212and 213, using the numbering according to SEQ ID NO: 6, and furthercomprising at least one chelating agent wherein said chelating agent ata concentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0.

A further embodiment of the invention relates to a compositioncomprising a variant of a parent alpha-amylase wherein the variantalpha-amylase comprises a substitution at one or more positions selectedfrom the group consisting of 193, 195, 197, 198, 200, 203, 206, 210, 212and 213, using the numbering according to SEQ ID NO: 6, and furthercomprising at least one chelating agent wherein said chelating agent ata concentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0, and optionally a cleaning adjunct.

A further embodiment of the invention relates to a compositioncomprising a variant of a parent alpha-amylase wherein the variantalpha-amylase comprises an amino acid sequence which is at least 70%identical to SEQ ID NO: 6 and further comprises a substitution at one ormore positions selected from the group consisting of 193, 195, 197, 198,200, 203, 206, 210, 212 and 213, using the numbering according to SEQ IDNO: 6, and further comprising at least one chelating agent wherein saidchelating agent at a concentration below 10 mM is capable of reducingthe concentration of free calcium ions from 2.0 mM to 0.10 mM whenmeasured at 21° C. and pH 8.0.

Thus the chelating agent according to the invention is able to reducethe free calcium ion concentration from 2.0 mM to 0.10 mM at aconcentration lower than the concentration of citrate necessary toreduce the free calcium ion concentration from 2.0 mM to 0.10 mM at thesame conditions.

Alternatively the strength of the complex formed between the chelatingagent and metal ions such as calcium and/or magnesium, is expressed asthe log K value (equilibrium or binding or dissociating or stabilityconstant). This constant may be measured at a given pH, at a giventemperature and at a given ionic strength.

As mentioned above the strength of the complex formed between thechelating agent and the metal ions e.g. calcium and/or magnesium may beexpressed as the log K value (equilibrium or binding or dissociating orstability constant), the constant may be measured by isothermaltitration calorimetry (ITC) as described in A. Nielsen et al., Anal.Biochem. Vol. 314, (2003), pp 227-234 and from the K value, the log Kcan be calculated as the logarithm of the K value (base 10). The log Kvalue measured by this method will depend on the temperature, pH, ionstrength, so it is important when comparing log K values, that they aredetermined at similar, preferably the same, conditions. Furthermore, byintroducing a standard as reference, such as citrate, impacts fromvariations in the experiments can be reduced. Preferably log K isdetermined as described under “Materials and Methods” of the presentapplication thus in one embodiment of the invention the chelating agentin the composition according to the invention has a log K of at least 3,such as at least 4, such as at least 5, such as at least 6, such as atleast 7, such as at least 8, such as at least 9, such as at least 10,such as at least 11, when the log K is measured at pH 10 and 19° C. asdescribed under “Materials and Methods”. The log K value of thechelating agent in the compositions according to the invention may alsobe in the range 3-11, such as 3-10, such as 3-9, such as 3-8, such as4-11, such as 5-11 such as 6-11, such as 4-10, such as 5-10, such as4-9, such as 5-9, such as 4-8, in particularly 5-8. Preferably, the logK of the chelating agent in the composition according to the inventionis a factor of at least 1, such as at least 1.33, such as at least 1.67,such as at least 2, such as at least 2.33, such as at least 2.67, suchas at least 3, such as at least 3.33, such as at least 3.67 times thelog K of citrate determined as described under “Materials and Methods”.The chelating agent in the compositions according to the invention mayalso be in the range of a factor 1-3.67, such as 1-3.33, such as 1-3.00,such as 1-2.67, such as 1.33-3.67, such as 1.33-3.33, such as 1.33-3.00,such as 1.33-2.67, such as 1.67-3.67, such as 1.67-3.33, such as 1.67-3,in particular 1.67-2.67 times the log K of citrate determined asdescribed under “Materials and Methods”.

Useful chelating agents may be, but are not limited to, the following:N-(1,2-dicarboxy-ethyl)-D,L-aspartic acid (IDS),N-(2-hydroxyethyl)iminodiacetic acid (EDG), aspartic acid-N-monoaceticacid (ASMA), aspartic acid-N,N-diacetic acid (ASDA), aspartic acid-N—monopropionic acid (ASMP), iminodisuccinic acid (IDA), N—(2-sulfomethyl) aspartic acid (SMAS), N-(2-sulfoethyl) aspartic acid(SEAS), N-(2-sulfomethyl) glutamic acid (SMGL), N-(2-sulfoethyl)glutamic acid (SEGL), N-methyliminodiacetic acid (MIDA),α-alanine-N,N-di-acetic acid (α-ALDA), serine-N,N-diacetic acid (SEDA),isoserine-N,N-diacetic acid (ISDA), phenylalanine-N,N-diacetic acid(PHDA), anthranilic acid-N,N-diacetic acid (ANDA), sulfanilic acid-N,N-diacetic acid (SLDA), taurine-N, N-diacetic acid (TUDA),sulfomethyl-N,N-diacetic acid (SM DA),N-(hydroxyethyl)-ethylidenediaminetriacetate (HEDTA), diethanolglycine(DEG), aminotris(methylenephosphonic acid) (ATMP).

The preferred chelating agent may contain an amino group and may be,e.g., an amino-polycarboxylate or a phosphonate. It may be a monomericmolecule comprising one, two or three amino groups (typically secondaryor tertiary amino groups), and it may contain two, three, four or fivecarboxyl groups or even more carboxyl groups. The chelating agents maybe phosphorus containing or without phosphor. There are many ways ofgrouping chelating agents one way might be as follows:

Chelating agents may be carboxylates or be based on carboxylate groupslike EDTA (ethylene diamine tetraacetate), NTA(2,2′,2″-nitrilotriacetate), citrate,2-hydroxypropan-1,2,3-tricarboxylate, DTPA(diethylenetriaminepentaacetic acid), MGDA (methylglycinediacetic acidor N,N′-bis(carboxymethyl)alanine), EGTA (ethylene glycol tetraaceticacid), EDDS (ethylenediamine-N,N′-disuccinic acid), GLDA (L-Glutamicacid, N,N-diacetic acid), Polycarboxylates such as PAA [poly(acrylicacid)], PAA/PMA [copoly(acrylic acid/maleic acid)].

Chelating agents containing phosphorous may be polyphosphates orphosphonates, such as Sodium tripolyphosphate (STP), HEDP(1-Hydroxyethylidene-1,1-Diphosphonic Acid), EDTMP[bis(phosphonomethyl)amino] methylphosphonic acid] or (ethylenediaminetetra(methylene phosphonic acid)), EDTMPA(ethylenediaminetetramethylenetetraphosphonic acid), DTPMP(diethylenetriamine penta (methylene phosphonic acid), DTMPA(diethylenetri-aminepenta(methylenehosphonic acid)). The chelatingagents may contain nitrogen such as in EDTA, NTA, DTPA, PDTA, GLDA,MGDA, EDDS, EDTMP, EDTMPA, and DTPMP or ASMA, ASDA, ASMP, IDA, SMAS,SEAS, SMGL, SEGL, MIDA, α-ALDA, SEDA, ISDA, PHDA, ANDA, SLDA, TUDA,SMDA, HEDTA, DEG, ATMP, or mixtures thereof.

Thus, the preferred chelating agents may be but are not limited to thefollowing: ethylene-diamine-tetra-acetic acid (EDTA), diethylenetriamine penta methylene phosphonic acid (DTMPA, DTPMP), hydroxy-ethanediphosphonic acid (HEDP), ethylenediamine N,N′-disuccinic acid (EDDS),methyl glycine di-acetic acid (MGDA), diethylene triamine penta aceticacid (DTPA), propylene diamine tetraacetic acid (PDTA),2-hydroxypyridine-N-oxide (HPNO), methyl glycine diacetic acid (MGDA),glutamic acid N,N-diacetic acid (N,N-dicarboxymethyl glutamic acidtetrasodium salt (GLDA) and nitrilotriacetic acid (NTA) or mixturesthereof. The chelating agents may be present in their acid form or asalt, preferably the chelating agents may be present as a sodium,ammonium or potassium salt.

Further chelating agents may be chelating agents which originate fromplant material, such as e.g. starch-containing material as described indetail below. Examples of such natural chelating agents are, but are notlimited to, phytic acid (also known as Inositol hexaphosphoric acid(IP6), or phytin, or phytate when in salt for), Inositol diphosphoricacid, Inositol triphosphoric or Inositol pentaphosphoric acid.

Chelating agent may be present in the composition in an amount from0.0001 wt % to 20 wt %, preferably from 0.01 to 10 wt %, more preferablyfrom 0.1 to 5 wt %.

Parent alpha-amylase: The parent alpha-amylase may in principle be anyalpha-amylase for which it is desired to prepare a variant havingimproved stability during storage or in use, e.g. during wash or in astarch hydrolyzing process. The improved stability may thus be observedas a reduced loss of amylolytic activity during storage or as anincreased activity and performance during use. Known alpha-amylases arederived from a wide selection of organisms including Bacteria, such asfrom species of the genus Bacillus e.g. Bacillus licheniformis; fromspecies of fungi, such as Aspergillus oryzae (TAKA-amylase) orAspergillus niger; from plants such as barley and from mammals. Theparent alpha-amylase may in principle be any such alpha-amylaseirrespective of the origin.

It is well known that a number of alpha-amylases produced by Bacillusspp. are highly identical on the amino acid level. Because of thesubstantial identity found between these alpha-amylases, they areconsidered to belong to the same class of alpha-amylases, namely theclass of “Termamyl-like alpha-amylases”.

Accordingly, in the present context, the term “Termamyl-like”alpha-amylase” is intended to indicate an alpha-amylase, in particularBacillus alpha-amylase, which, at the amino acid level, exhibits asubstantial identity i.e. at least 60% to the B. licheniformisalpha-amylase having the amino acid sequence shown in SEQ ID NO: 20(Termamyl™), herein.

Termamyl-Like Alpha-Amylases

The identity of a number of known Bacillus alpha-amylases can be foundin the below Table 1:

TABLE 1 SEQ ID Percent identity NO #707 AP1378 BAN BSG SP690 SP722 AA560Termamyl #707 8 100.0 86.4 66.9 66.5 87.6 86.2 95.5 68.1 AP1378 18 86.4100.0 67.1 68.1 95.1 86.6 86.0 69.4 BAN 14 66.9 67.1 100.0 65.6 67.168.8 66.9 80.7 BSG 16 66.5 68.1 65.6 100.0 67.9 67.1 66.3 65.4 SP690 1287.6 95.1 67.1 67.9 100.0 87.2 87.0 69.2 SP722 6 86.2 86.6 68.8 67.187.2 100.0 86.8 70.8 AA560 10 95.5 86.0 66.9 66.3 87.0 86.8 100.0 68.3Termamyl 20 68.1 69.4 80.7 65.4 69.2 70.8 68.3 100.0

For instance, the B. licheniformis alpha-amylase comprising the aminoacid sequence shown in SEQ ID NO: 20 (commercially available asTermamyl™) has been found to be about 81% homologous with the B.amyloliquefaciens alpha-amylase comprising the amino acid sequence shownin SEQ ID NO: 14 (BAN) and about 65% homologous with the B.stearothermophilus alpha-amylase comprising the amino acid sequenceshown in SEQ ID NO: 16 (BSG). Further homologous alpha-amylases includeSP722 and SP690 disclosed in WO 95/26397 and further depicted in SEQ IDNO: 6 and SEQ ID NO: 12, respectively, herein. Other amylases are theAA560 alpha-amylase derived from Bacillus sp. and shown in SEQ ID NO:10, and the SP707 or #707 alpha-amylase derived from Bacillus sp., shownin SEQ ID NO: 8 and described by Tsukamoto et al., Biochemical andBiophys-ical Research Communications, 151 (1988), pp. 25-31. Furtherhomolog alpha-amylase is the KSM AP1378 alpha-amylase is disclosed in WO97/00324 (from KAO Corporation) SEQ ID NO: 18. Yet another homologalpha-amylase is the SP.7-7 alpha-amylase with SEQ ID NO: 22. Anothersuitable parent amylase is the K 38 SEQ ID NO: 2 or the B. circulansamylase with SEQ ID NO: 4 and SEQ ID NO: 24, described in WO2005/001064.

Still further interesting alpha-amylases include the alpha-amylaseproduced by the B. licheniformis strain described in EP 0252666 (ATCC27811), and the alpha-amylases identified in WO 91/00353 and WO94/18314. Other commercial Termamyl-like alpha-amylases are comprised inthe products sold under the following tradenames: OPTITHERM™ andTAKATHERM™ (Solvay); MAXAMYL™ (available from Gist-brocades/Genencor),SPEZYM® AA and SPEZYME® DELTA AA (available from Genencor), andKEISTASE™ (available from Daiwa), Dex lo, GC 521 (available fromGenencor) and Ultraphlow (from Enzyme Biosystems), PURASTAR™ ST 5000E,PURASTAR™ HPAM L, POWERASE®, Spezyme FRED, GC358, CLEARFLOW® AA(fromDanisco), or the alpha-amylase TS-23 (SEQ ID NO: 26 (Lin et al,J.App.Microbiol. 1997, 82, 325-334).

The non-Termamyl-like alpha-amylase may, e.g., be a fungalalpha-amylase, a mammalian or a plant alpha-amylase or a bacterialalpha-amylase (different from a Termamyl-like alpha-amylase). Specificexamples of such alpha-amylases include the Aspergillus oryzae TAKAalpha-amylase, the A. niger acid alpha-amylase, the Bacillus subtilisalpha-amylase, the porcine pancreatic alpha-amylase and a barleyalpha-amylase. All of these alpha-amylases have elucidated structures,which are markedly different from the structure of a typicalTermamyl-like alpha-amylase as referred to herein.

The fungal alpha-amylases mentioned above, i.e., derived from A. nigerand A. oryzae, are highly identical on the amino acid level andgenerally considered to belong to the same family of alpha-amylases. Thefungal alpha-amylase derived from Aspergillus oryzae is commerciallyavailable under the trade name Fungamyl™

Parent Hybrid Alpha-Amylases

The parent alpha-amylase may be a hybrid alpha-amylase, i.e., analpha-amylase, which comprises a combination of partial amino acidsequences derived from at least two alpha-amylases.

The parent hybrid alpha-amylase may be one, which on the basis of aminoacid homology and/or immunological cross-reactivity and/or DNAhybridization (as defined above) can be determined to belong to theTermamyl-like alpha-amylase family. In this case, the hybridalpha-amylase is typically composed of at least one part of aTermamyl-like alpha-amylase and part(s) of one or more otheralpha-amylases selected from Termamyl-like alpha-amylases ornon-Termamyl-like alpha-amylases of microbial (bacterial or fungal)and/or mammalian origin.

Thus, the parent hybrid alpha-amylase may comprise a combination ofpartial amino acid sequences deriving from at least two Termamyl-likealpha-amylases, or from at least one Termamyl-like and at least onenon-Termamyl-like bacterial alpha-amylase, or from at least oneTermamyl-like and at least one fungal alpha-amylase. The Termamyl-likealpha-amylase from which a partial amino acid sequence derives may beany of those Termamyl-like, alpha-amylases referred to herein.

In one embodiment the parent Termamyl-like alpha-amylase is a hybridTermamyl-like alpha-amylase identical to the Bacillus licheniformisalpha-amylase shown in SEQ ID NO: 20, except that the N-terminal 35amino acid residues (of the mature protein) is replaced with theN-terminal 33 amino acid residues of the mature protein of the Bacillusamyloliquefaciens alpha-amylase shown in SEQ ID NO: 14 said hybrid mayfurther have the following mutations: H156Y+A181T+N190F+A209V+Q264S(using the numbering in SEQ ID NO: 6) referred to as LE174. In anotherembodiment LE174 further comprising the mutations G48A, T491, G107A,I201F, referred to as LE399. In one embodiment the parent is SEQ ID NO:16 with the mutations I181*+G182*+N195F.

In a preferred aspect of the invention the parent alpha-amylase is analpha-amylase, which has the amino acid sequence shown in SEQ ID NO: 2,4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26 herein. In anotherpreferred aspect the parent alpha-amylase is an alpha-amylase, whichdisplays 60%, preferred at least 65%, preferred at least 70%, preferredat least 75% preferred at least 80%, preferred at least 81%, preferredat least 82%, preferred at least 83%, preferred at least 84% preferredat least 85%, preferred at least 86%, preferred at least 87%, preferredat least 88%, preferred at least 89%, especially preferred at least 90%,especially preferred at least 91%, especially preferred at least 92%,especially preferred at least 93%, especially preferred at least 94%,even especially more preferred at least 95% homology, more preferred atleast 96%, more preferred at least 97%, more preferred at least 98%,more preferred at least 99% of the mature polypeptide of SEQ ID NO: 2,4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26.

In one aspect, the parent alpha-amylases have an amino acid sequencethat differs (e.g., deletion, insertion or substitution) by one orseveral amino acids, preferably ten amino acids, more preferably bynine, eight, seven, six, five amino acids, more preferably by four aminoacids, even more preferably by three amino acids, most preferably by twoamino acids, and even most preferably by one amino acid from the maturepolypeptide of SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or26.

The parent alpha-amylase may be an alpha-amylase which displaysimmunological cross-reactivity with an antibody raised against analpha-amylase having one of the amino acid sequences selected from thegroup consisting of SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22,24 and 26. In a preferred embodiment, the parent alpha-amylase is onewherein the antibody raised against the parent alpha-amylase displays anaffinity or avidity for an alpha-amylase having one of the amino acidsequences shown in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26 in a competitive assay technique such as e.g. ELISA or BiaCore,respectively, or that displays an affinity or avidity that is comparableto that of the parent alpha-amylase, and wherein the antibody raisedagainst the alpha-amylase having one of the amino acid sequences shownin SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26 displaysin said competitive assay technique an affinity or avidity for theparent alpha-amylase that is comparable with the affinity or avidity forthe alpha-amylase having one of the amino acid sequences shown in SEQ IDNO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26. In furtherembodiments, the parent alpha-amylase is one which has an affinity oravidity which is at least 70%, preferred at least 75% preferred at least80%, preferred at least 85%, preferred at least 90%, preferred at least95%, preferred at least 100%, preferred at least 110%, preferred atleast 120%, especially preferred at least 125% of the affinity oravidity of the alpha-amylase having one of the amino acid sequencesshown in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26.

The parent alpha-amylase may also be an alpha-amylase which is encodedby a DNA sequence which hybridizes to the DNA sequence encoding theabove-specified alpha-amylases, which are apparent from SEQ ID NO: 1, 3,5, 7, 9, 11, 13, 15, 17, 19, 21, 23 or 25 of the present application.Thus one embodiment concerns a variant alpha-amylase of a parentalpha-amylase, where the parent alpha-amylase is:

(A) derived from a strain of B. licheniformis, B. amyloliquefaciens, B.stearothermophilus, Bacillus sp. or KSM AP1378,

(B) selected from the group having amino acid sequences as shown in SEQID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26,

(C) having a sequence identity to one of SEQ ID NO: 2, 4, 6, 8, 10, 12,14, 16, 18, 20, 22, 24 or 26 of at least 70%, preferably at least 80%,more preferably at least about 90%, even more preferably at least 95%,even more preferably at least 97%, and even more preferably at least99%, or

(D) encoded by a nucleic acid sequence, which hybridizes under low,preferably medium, preferred high stringency conditions, with thenucleic acid sequence of one of SEQ ID NO: 1, 3, 5, 7, 9, 11, 13, 15,17, 19, 21, 23 or 25.

In one aspect, the parent polypeptide having amylolytic enhancingactivity is (a) a polypeptide comprising an amino acid sequence havingat least 60% identity with the mature polypeptide of SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26; (b) a polypeptide encoded by apolynucleotide that hybridizes under at least low stringency conditionswith (i) the mature polypeptide coding sequence of SEQ ID NO: 1, 3, 5,7, 9, 11, 13, 15, 17, 19, 21, 23 or 25, (ii) the genomic DNA sequencecomprising the mature polypeptide coding sequence of SEQ ID NO: 1, 3, 5,7, 9, 11, 13, 15, 17, 19, 21, 23 or 25, or (iii) a full-lengthcomplementary strand of (i) or (ii); or

(c) a polypeptide encoded by a polynucleotide comprising a nucleotidesequence having at least 60% identity with the mature polypeptide codingsequence of SEQ ID NO: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 or 25.

When a particular variant of a parent alpha-amylase is referred to—in aconventional manner—by reference to modification (e.g., deletion orsubstitution) of specific amino acid residues in the amino acid sequenceof a specific alpha-amylase, it is to be understood that variants ofanother alpha-amylase modified in the equivalent position(s) (asdetermined from the best possible amino acid sequence alignment betweenthe respective amino acid sequences) are encompassed thereby.

In a particular aspect of the invention the parent alpha-amylase is avariant of a naturally occurring (wild type), prepared by any suitablemeans. For instance, the parent alpha-amylase may be a variant of anaturally occurring alpha-amylase which has been modified or altered inthe amino acid sequence.

The parent alpha-amylase may be a substantially homologous parentalpha-amylase which may have one or more (several) amino acidsubstitutions, deletions and/or insertions. These changes are preferablyof a minor nature, that is conservative amino acid substitutions asdescribed below and other substitutions that do not significantly affectthe three-dimensional folding or activity of the protein or polypeptide;small deletions, typically of one to about 30 amino acids; and smallamino- or carboxyl-terminal extensions, such as an amino-terminalmethionine residue, a small linker peptide of up to about 20-25residues, or a small extension that facilitates purification (anaffinity tag), such as a poly-histidine tract, or protein A (Nilsson etal., 1985, EMBO J. 4: 1075; Nilsson et al., 1991, Methods Enzymol. 198:3. See, also, in general, Ford et al., 1991, Protein Expression andPurification 2: 95-107.

Although the changes described above preferably are of a minor nature,such changes may also be of a substantive nature such as fusion oflarger polypeptides of up to 300 amino acids or more both as amino- orcarboxyl-terminal extensions.

When a particular variant of a parent alpha-amylase (variant of theinvention) is referred to—in a conventional manner—by reference tomodification (e.g., deletion or substitution) of specific amino acidresidues in the amino acid sequence of a specific parent alpha-amylase,it is to be understood that variants of another parent alpha-amylasemodified in the equivalent position(s) (as determined from the bestpossible amino acid sequence alignment between the respective amino acidsequences) are encompassed thereby.Homology (Sequence Identity)

The homology may be determined as the degree of identity between the twosequences indicating a derivation of the first sequence from the second.For purposes of the present invention, the degree of sequence identitybetween two amino acid sequences is determined using theNeedleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol.48: 443-453) as implemented in the Needle program of the EMBOSS package(EMBOSS: The European Molecular Biology Open Software Suite, Rice etal., 2000, Trends Genet. 16: 276-277), preferably version 3.0.0 orlater. The optional parameters used are gap open penalty of 10, gapextension penalty of 0.5, and the EBLOSUM62 (EMBOSS version of BLOSUM62)substitution matrix. The output of Needle labeled “longest identity”(obtained using the —nobrief option) is used as the percent identity andis calculated as follows:(Identical Residues×100)/(Length of Alignment−Total Number of Gaps inAlignment)

For purposes of the present invention, the degree of sequence identitybetween two de-oxyribonucleotide sequences is determined using theNeedleman-Wunsch algorithm (Needleman and Wunsch, 1970, supra) asimplemented in the Needle program of the EMBOSS package (EMBOSS: TheEuropean Molecular Biology Open Software Suite, Rice et al., 2000,supra), preferably version 3.0.0 or later. The optional parameters usedare gap open penalty of 10, gap extension penalty of 0.5, and theEDNAFULL (EMBOSS version of NCBI NUC4.4) substitution matrix. The outputof Needle labeled “longest identity” (obtained using the —nobriefoption) is used as the percent identity and is calculated as follows:(Identical Deoxyribonucleotides×100)/(Length of Alignment−Total Numberof Gaps in Alignment).

The homology or sequence identity may also be determined as the degreeof identity between the two sequences indicating a derivation of thefirst sequence from the second. The homology may suitably be determinedby means of older computer programs known in the art such as GAPprovided in the GCG program package. Thus, Gap GCGv8 may be used withthe default scoring matrix for identity and the following defaultparameters: GAP creation penalty of 5.0 and GAP extension penalty of0.3, respectively for nucleic acidic sequence comparison, and GAPcreation penalty of 3.0 and GAP extension penalty of 0.1, respectively,for protein sequence comparison. GAP uses the method of Needleman andWunsch, (1970), J. Mol. Biol. 48, p. 443-453, to make alignments and tocalculate the identity.

A structural alignment between e.g. Termamyl and an alpha-amylase may beused to identify equivalent/corresponding positions in otheralpha-amylases. One method of obtaining said structural alignment is touse the Pile Up programme from the GCG package using default values ofgap pen-alties, i.e., a gap creation penalty of 3.0 and gap extensionpenalty of 0.1. Other structural alignment methods include thehydrophobic cluster analysis (Gaboriaud et al., (1987), FEBS LETTERS224, pp. 149-155) and reverse threading (Huber, T; Torda, A E, PROTEINSCIENCE Vol. 7, No. 1 pp. 142-149 (1998). Properties of thealpha-amylases, i.e., the immunological cross reactivity, may be assayedusing an antibody raised against, or reactive with, at least one epitopeof the relevant Ter-mamyl-like alpha-amylase. The antibody, which mayeither be monoclonal or polyclonal, may be produced by methods known inthe art, e.g., as described by Hudson et al., Practical Immunology,Third edition (1989), Blackwell Scientific Publications. Theimmunological cross-reactivity may be determined using assays known inthe art, examples of which are Western Blotting or radialimmu-nodiffusion assay, e.g., as described by Hudson et al., 1989.

Hybridisation

In one aspect, the parent polypeptide having amylolytic activity isencoded by a polynucleotide that hybridizes under very low stringencyconditions, preferably low stringency conditions, more preferably mediumstringency conditions, more preferably medium-high stringencyconditions, even more preferably high stringency conditions, and mostpreferably very high stringency conditions with (i) the maturepolypeptide coding sequence of SEQ ID NO: 1, 3, 5, 7, 9, 11, 13, 15, 17,19, 21, 23 or 25, (ii) the genomic DNA sequence comprising the maturepolypeptide coding sequence of SEQ ID NO: 1, (iii) a subsequence of (i)or (ii), or (iv) a full-length complementary strand of (i), (ii), or(iii) (J. Sambrook, E.F. Fritsch, and T. Maniatis, 1989, MolecularCloning, A Laboratory Manual, 2d edition, Cold Spring Harbor, N.Y.). Thesubsequence may encode a polypeptide fragment having amylolyticactivity. In one aspect, the complementary strand is the full-lengthcomplementary strand of the mature polypeptide coding sequence of SEQ IDNO: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 or 25.

An oligonucleotide probe used in the characterization of thealpha-amylase in accordance with the desired property which may bealpha-amylase activity may suitably be prepared on the basis of the fullor partial nucleotide or amino acid sequence of the alpha-amylase inquestion.

Suitable conditions for testing hybridization involve presoaking in5×SSC (standard sodium citrate, 1×SSC corresponds to 0.1650 M NaCl) andprehybridizing for 1 hour at ˜40° C. in a solution of 20% formamide,5×Denhardt's solution, 50 mM sodium phosphate, pH 6.8, and 50 mg ofdenatured sonicated calf thymus DNA, followed by hybridization in thesame solution supplemented with 100 mM ATP (adenosine triphosphate) for18 hours at ˜40° C., followed by three times washing of the filter in2×SSC, 0.2% SDS (sodium dodecylsulfate) at 40° C. for 30 minutes (lowstringency), preferred at 50° C. (medium stringency), more preferably at65° C. (high stringency), even more preferably at ˜75° C. (very highstringency). More details about the hybridization method can be found inSambrook et al., Molecular_Cloning: A Laboratory Manual, 2nd Ed., ColdSpring Harbor, 1989.

In the present context, “derived from” is intended not only to indicatean alpha-amylase produced or producible by a strain of the organism inquestion, but also an alpha-amylase encoded by a DNA sequence isolatedfrom such strain and produced in a host organism transformed with saidDNA sequence. Finally, the term is intended to indicate analpha-amylase, which is encoded by a DNA sequence of synthetic and/orcDNA origin and which has the identifying characteristics of thealpha-amylase in question. The term is also intended to indicate thatthe parent alpha-amylase may be a variant of a naturally occurringalpha-amylase, i.e. a variant, which is the result of a modification(insertion, substitution, deletion) of one or more amino acid residuesof the naturally occurring alpha-amylase.

Methods for Preparing Alpha-Amylase Variants

Several methods for introducing mutations into genes are known in theart. After a brief discussion of the cloning of alpha-amylase-encodingDNA sequences, methods for generating mutations at specific sites withinthe alpha-amylase-encoding sequence will be discussed.

Cloning a DNA Sequence Encoding an Alpha-Amylase

The DNA sequence encoding a parent alpha-amylase may be isolated fromany cell or microorganism producing the alpha-amylase in question, usingvarious methods well known in the art. First, a genomic DNA and/or cDNAlibrary should be constructed using chromosomal DNA or messenger RNAfrom the organism that produces the alpha-amylase to be studied. Then,if the amino acid sequence of the alpha-amylase is known, homologous,labeled oligonucleotide probes may be synthesized and used to identifyalpha-amylase-encoding clones from a genomic library prepared from theorganism in question. Alternatively, a labeled oligonucleotide probecontaining sequences homologous to a known alpha-amylase gene could beused as a probe to identify alpha-amylase-encoding clones, usinghybridization and washing conditions of lower stringency.

Yet another method for identifying alpha-amylase-encoding clones wouldinvolve inserting fragments of genomic DNA into an expression vector,such as a plasmid, transforming alpha-amylase-negative bacteria with theresulting genomic DNA library, and then plating the transformed bacteriaonto agar containing a substrate for alpha-amylase, thereby allowingclones expressing the alpha-amylase to be identified.

Alternatively, the DNA sequence encoding the enzyme may be preparedsynthetically by established standard methods, e.g., thephosphoroamidite method described by S.L. Beaucage and M. H. Caruthers,1981, Tetrahedron Letters 22: 1859 or the method described by Matthes etal., 1984, EMBO J. 3 801-805. In the phosphoroamidite method,oligonucleotides are synthesized, e.g., in an automatic DNA synthesizer,purified, annealed, ligated and cloned in appropriate vectors.

Finally, the DNA sequence may be of mixed genomic and synthetic origin,mixed synthetic and cDNA origin or mixed genomic and cDNA origin,prepared by ligating fragments of synthetic, genomic or cDNA origin (asappropriate, the fragments corresponding to various parts of the entireDNA sequence), in accordance with standard techniques. The DNA sequencemay also be prepared by polymerase chain reaction (PCR) using specificprimers, for instance as described in U.S. Pat. No. 4,683,202 or R. K.Saiki et al., 1988, Science Vol. 239 no. 4839 pp. 487-491.

Site-Directed Mutagenesis

Once an alpha-amylase-encoding DNA sequence has been isolated, anddesirable sites for mutation identified, mutations may be introducedusing synthetic oligonucleotides. These oligonucleotides containnucleotide sequences flanking the desired mutation sites; mutantnucleotides are inserted during oligonucleotide synthesis. In a specificmethod, a single-stranded gap of DNA, bridging thealpha-amylase-encoding sequence, is created in a vector carrying thealpha-amylase gene. Then the synthetic nucleotide, bearing the desiredmutation, is annealed to a homologous portion of the single-strandedDNA. The remaining gap is then filled in with DNA polymerase I (Klenowfragment) and the construct is ligated using T4 ligase. A specificexample of this method is described in Morinaga et al., 1984,Biotechnology 2, pp. 636-639. U.S. Pat. No. 4,760,025 disclose theintroduction of oligonucleotides encoding multiple mutations byperforming minor alterations of the cassette. However, an even greatervariety of mutations can be introduced at any one time by the Morinagamethod, because a multitude of oligonucleotides, of various lengths, canbe introduced.

Another method for introducing mutations into alpha-amylase-encoding DNAsequences is described in Nelson and Long (1989). It involves the 3-stepgeneration of a PCR fragment containing the desired mutation introducedby using a chemically synthesized DNA strand as one of the primers inthe PCR reactions. From the PCR-generated fragment, a DNA fragmentcarrying the mutation may be isolated by cleavage with restrictionendonucleases and reinserted into an expression plasmid.

Random Mutagenesis

Random mutagenesis is suitably performed either as localised orregion-specific random mutagenesis in at least three parts of the genetranslating to the amino acid sequence shown in question, or within thewhole gene.

The random mutagenesis of a DNA sequence encoding a parent alpha-amylasemay be conveniently performed by use of any method known in the art.

In relation to the above, a further aspect of the present inventionrelates to a method for generating a variant of a parent alpha-amylase,e.g., wherein the variant exhibits an altered starch affinity relativeto the parent, the method comprising:

-   -   (a) subjecting a DNA sequence encoding the parent alpha-amylase        to random mutagenesis,    -   (b) expressing the mutated DNA sequence obtained in step (a) in        a host cell, and    -   (c) screening for host cells expressing an alpha-amylase variant        which has an altered starch affinity relative to the parent        alpha-amylase.        Step (a) of the above method of the invention is preferably        performed using doped primers. For instance, the random        mutagenesis may be performed by use of a suitable physical or        chemical mutagenizing agent, by use of a suitable        oligonucleotide, or by subjecting the DNA sequence to PCR        generated mutagenesis. Furthermore, the random mutagenesis may        be performed by use of any combination of these mutagenizing        agents. The mutagenizing agent may, e.g., be one, which induces        transitions, transversions, inversions, scrambling, deletions,        and/or insertions.

Examples of a physical or chemical mutagenizing agent suitable for thepresent purpose include ultraviolet (UV) irradiation, hydroxylamine,N-methyl-N′-nitro-N-nitrosoguanidine (MNNG), O-methyl hydroxylamine,nitrous acid, ethyl methane sulphonate (EMS), sodium bisulphite, formicacid, and nucleotide analogues. When such agents are used, themutagenesis is typically performed by incubating the DNA sequenceencoding the parent enzyme to be mutagenized in the presence of themutagenizing agent of choice under suitable conditions for themutagenesis to take place, and selecting for mutated DNA having thedesired properties. When the mutagenesis is performed by the use of anoligonucleotide, the oligonucleotide may be doped or spiked with thethree non-parent nucleotides during the synthesis of the oligonucleotideat the positions, which are to be changed. The doping or spiking may bedone so that codons for unwanted amino acids are avoided. The doped orspiked oligonucleotide can be incorporated into the DNA encoding thealpha-amylase enzyme by any published technique, using e.g., PCR, LCR orany DNA polymerase and ligase as deemed appropriate. Preferably, thedoping is carried out using “constant random doping”, in which thepercentage of wild type and mutation in each position is predefined.Furthermore, the doping may be directed toward a preference for theintroduction of certain nucleotides, and thereby a preference for theintroduction of one or more specific amino acid residues. The doping maybe made, e.g., so as to allow for the introduction of 90% wild type and10% mutations in each position. An additional consideration in thechoice of a doping scheme is based on genetic as well asprotein-structural constraints. The doping scheme may be made by usingthe DOPE program, which, inter alia, ensures that introduction of stopcodons is avoided. When PCR-generated mutagenesis is used, either achemically treated or non-treated gene encoding a parent alpha-amylaseis subjected to PCR under conditions that increase the mis-incorporationof nucleotides (Deshler 1992, Genetic Analysis: BiomolecularEngineering, 9(4), pp 103-106; Leung et al., 1989, Technique, Vol. 1,pp. 11-15). A mutator strain of E. coli (Fowler et al., 1974, Molec.Gen. Genet., 133, pp. 179-191), S. cereviseae or any other microbialorganism may be used for the random mutagenesis of the DNA encoding thealpha-amylase by, e.g., transforming a plasmid containing the parentglycosidase into the mutator strain, growing the mutator strain with theplasmid and isolating the mutated plasmid from the mutator strain. Themutated plasmid may be subsequently transformed into the expressionorganism. The DNA sequence to be mutagenized may be conveniently presentin a genomic or cDNA library prepared from an organism expressing theparent alpha-amylase. Alternatively, the DNA sequence may be present ona suitable vector such as a plasmid or a bacteriophage, which as suchmay be incubated with or otherwise exposed to the mutagenising agent.The DNA to be mutagenized may also be present in a host cell either bybeing integrated in the genome of said cell or by being present on avector harboured in the cell. Finally, the DNA to be mutagenized may bein isolated form. It will be understood that the DNA sequence to besubjected to random mutagenesis is preferably a cDNA or a genomic DNAsequence. In some cases it may be convenient to amplify the mutated DNAsequence prior to performing the expression step b) or the screeningstep c). Such amplification may be performed in accordance with methodsknown in the art, the presently preferred method being PCR-generatedamplification using oligonucleotide primers prepared on the basis of theDNA or amino acid sequence of the parent enzyme. Subsequent to theincubation with or exposure to the mutagenising agent, the mutated DNAis expressed by culturing a suitable host cell carrying the DNA sequenceunder conditions allowing expression to take place. The host cell usedfor this purpose may be one which has been transformed with the mutatedDNA sequence, optionally present on a vector, or one which was carriedthe DNA sequence encoding the parent enzyme during the mutagenesistreatment. Examples of suitable host cells are the following: grampositive bacteria such as Bacillus subtilis, Bacillus licheniformis,Bacillus lentus, Bacillus brevis, Bacillus stearothermophilus, Bacillusalkalophilus, Bacillus amyloliquefaciens, Bacillus coagulans, Bacilluscirculans, Bacillus lautus, Bacillus megaterium, Bacillus thuringiensis,Streptomyces lividans or Streptomyces murinus; and gram-negativebacteria such as E. coli. The mutated DNA sequence may further comprisea DNA sequence encoding functions permitting expression of the mutatedDNA sequence.

Localised Random Mutagenesis

The random mutagenesis may be advantageously localised to a part of theparent alpha-amylase in question. This may, e.g., be advantageous whencertain regions of the enzyme have been identified to be of particularimportance for a given property of the enzyme, and when modified areexpected to result in a variant having improved properties. Such regionsmay normally be identified when the tertiary structure of the parentenzyme has been elucidated and related to the function of the enzyme.

The localized or region-specific, random mutagenesis is convenientlyperformed by use of PCR generated mutagenesis techniques as describedabove or any other suitable technique known in the art. Alternatively,the DNA sequence encoding the part of the DNA sequence to be modifiedmay be isolated, e.g., by insertion into a suitable vector, and saidpart may be subsequently subjected to mutagenesis by use of any of themutagenesis methods discussed above.

Alternative Methods of Providing Alpha-Amylase Variants

Alternative methods for providing variants of the invention includegene-shuffling method known in the art including the methods e.g.,described in WO 95/22625 (from Affymax Technologies N.V.) and WO96/00343 (from Novo Nordisk A/S).

Expression of Alpha-Amylase Variants

According to the invention, a DNA sequence encoding the variant producedby methods described above, or by any alternative methods known in theart, can be expressed, in enzyme form, using an expression vector whichtypically includes control sequences encoding a promoter, operator,ribosome binding site, translation initiation signal, and, optionally, arepressor gene or various activator genes.

The recombinant expression vector carrying the DNA sequence encoding analpha-amylase variant of the invention may be any vector, which mayconveniently be subjected to recombinant DNA procedures, and the choiceof vector will often depend on the host cell into which it is to beintroduced. Thus, the vector may be an autonomously replicating vector,i.e., a vector, which exists as an extrachromosomal entity, thereplication of which is independent of chromosomal replication, e.g., aplasmid, a bacteriophage or an extrachromosomal element, minichromosomeor an artificial chromosome. Alternatively, the vector may be one which,when introduced into a host cell, is integrated into the host cellgenome and replicated together with the chromosome(s) into which it hasbeen integrated.

In the vector, the DNA sequence should be operably connected to asuitable promoter sequence. The promoter may be any DNA sequence, whichshows transcriptional activity in the host cell of choice and may bederived from genes encoding proteins either homologous or heterologousto the host cell. Examples of suitable promoters for directing thetranscription of the DNA sequence encoding an alpha-amylase variant ofthe invention, especially in a bacterial host, are the promoter of thelac operon of E. coli, the Streptomyces coelicoloragarase gene dagApromoters, the promoters of the Bacillus licheniformis alpha-amylasegene (amyL), the promoters of the Bacillus stearothermophilus maltogenicamylase gene (amyM), the promoters of the Bacillus amyloliquefaciensalpha-amylase (amyQ), the promoters of the Bacillus subtilis xylA andxylB genes etc. For transcription in a fungal host, examples of usefulpromoters are those derived from the gene encoding A. oryzae TAKAamylase, Rhizomucor miehei aspartic proteinase, A. niger neutralalpha-amylase, A. niger acid stable alpha-amylase, A. nigerglucoamylase, Rhizomucor miehei lipase, A. oryzae alkaline protease, A.oryzae triose phosphate isomerase or A. nidulans acetamidase.

The expression vector of the invention may also comprise a suitabletranscription terminator and, in eukaryotes, polyadenylation sequencesoperably connected to the DNA sequence encoding the alpha-amylasevariant of the invention. Termination and polyadenylation sequences maysuitably be derived from the same sources as the promoter.

The vector may further comprise a DNA sequence enabling the vector toreplicate in the host cell in question. Examples of such sequences arethe origins of replication of plasmids pUC19, pACYC177, pUB110, pE194,pAMB1 and pIJ702.

The vector may also comprise a selectable marker, e.g., a gene theproduct of which comple-ments a defect in the host cell, such as the dalgenes from B. subtilis or B. licheniformis, or one which confersantibiotic resistance such as ampicillin, kanamycin, chloramphenicol ortetracyclin resistance. Furthermore, the vector may comprise Aspergillusselection markers such as amdS, argB, niaD and sC, a marker giving riseto hygromycin resistance, or the selection may be accomplished byco-transformation, e.g., as described in WO 91/17243.

While intracellular expression may be advantageous in some respects,e.g., when using certain bacteria as host cells, it is generallypreferred that the expression is extracellular. In general, the Bacillusalpha-amylases mentioned herein comprise a pre-region permittingsecretion of the expressed protease into the culture medium. Ifdesirable, this pre-region may be replaced by a different preregion orsignal sequence, conveniently accomplished by substitution of the DNAsequences encoding the respective preregions.

The procedures used to ligate the DNA construct of the inventionencoding an alpha-amylase variant, the promoter, terminator and otherelements, respectively, and to insert them into suitable vectorscontaining the information necessary for replication, are well known topersons skilled in the art (cf., for instance, Sambrook et al.,Molecular Cloning: A Laboratory Manual, 2nd Ed., Cold Spring Harbor,1989).

The cell of the invention, either comprising a DNA construct or anexpression vector of the invention as defined above, is advantageouslyused as a host cell in the recombinant production of an alpha-amylasevariant of the invention. The cell may be transformed with the DNAconstruct of the invention encoding the variant, conveniently byintegrating the DNA construct (in one or more copies) in the hostchromosome. This integration is generally considered to be an advantageas the DNA sequence is more likely to be stably maintained in the cell.Integration of the DNA constructs into the host chromosome may beperformed according to conventional methods, e.g., by homologous orheterologous recombination. Alternatively, the cell may be transformedwith an expression vector as described above in connection with thedifferent types of host cells.

The cell of the invention may be a cell of a higher organism such as amammal or an insect, but is preferably a microbial cell, e.g., abacterial or a fungal (including yeast) cell.

Examples of suitable bacteria are gram-positive bacteria such asBacillus subtilis, Bacillus licheniformis, Bacillus lentus, Bacillusbrevis, Bacillus stearothermophilus, Bacillus alkalophilus, Bacillusamyloliquefaciens, Bacillus coagulans, Bacillus circulans, Bacilluslautus, Bacillus megaterium, Bacillus thuringiensis, or Streptomyceslividans or Streptomyces murinus, or gramne-gative bacteria such as E.coli. The transformation of the bacteria may, for instance, be effectedby protoplast transformation or by using competent cells in a mannerknown per se.

The yeast organism may favourably be selected from a species ofSaccharomyces or Schizosaccharomyces, e.g., Saccharomyces cerevisiae.The filamentous fungus may advantageously belong to a species ofAspergillus, e.g., Aspergillus oryzae or Aspergillus niger. Fungal cellsmay be transformed by a process involving protoplast formation andtransformation of the protoplasts followed by regeneration of the cellwall in a manner known per se. A suitable procedure for transformationof Aspergillus host cells is described in EP 238 023.

In yet a further aspect, the present invention relates to a method ofproducing an alpha-amylase variant of the invention, which methodcomprises cultivating a host cell as described above under conditionsconducive to the production of the variant and recovering the variantfrom the cells and/or culture medium.

The medium used to cultivate the cells may be any conventional mediumsuitable for growing the host cell in question and obtaining expressionof the alpha-amylase variant of the invention. Suitable media areavailable from commercial suppliers or may be prepared according topublished recipes (e.g., as described in catalogues of the American TypeCulture Collection).

The alpha-amylase variant secreted from the host cells may convenientlybe recovered from the culture medium by well-known procedures, includingseparating the cells from the medium by centrifugation or filtration,and precipitating proteinaceous components of the medium by means of asalt such as ammonium sulphate, followed by the use of chromatographicprocedures such as ion exchange chromatography, affinity chromatography,or the like.

Conventions for Designation of Variants

Using the numbering system originating from the amino acid sequence ofthe alpha-amylase disclosed in SEQ ID NO: 6 aligned with the amino acidsequence of a number of other alpha-amylases, it is possible to indicatethe position of an amino acid residue in an alpha-amylase in regions ofstructural homology.

In describing the various alpha-amylase variants of the presentinvention, the nomenclature described below is adapted for ease ofreference. In all cases, the accepted IUPAC single letter or tripleletter amino acid abbreviation is employed.

In the present description and claims, the conventional one-letter andthree-letter codes for amino acid residues are used. For ease ofreference, alpha-amylase variants of the invention are described by useof the following nomenclature:

Original amino acid(s): position(s): substituted amino acid(s)

According to this nomenclature, for instance the substitution of alaninefor asparagine in position 30 is shown as:

Ala30Asn or A30N

a deletion of alanine in the same position is shown as:

Ala30* or A30*

and insertion of an additional amino acid residue after position 30,such as lysine, is shown as:

Ala30AlaLys or A30AK

A deletion of a consecutive stretch of amino acid residues, such asamino acid residues 30-33, is indicated as (30-33)* or A (A30-N33).Deletion of a single amino acid residue may simply be disclosed as 30*.

Where a specific alpha-amylase contains a “deletion” in comparison withother alpha-amylases and an insertion is made in such a position this isindicated as:

*36Asp or *36D

for insertion of an aspartic acid in position 36.

Multiple mutations may be separated by plus signs or with a space, i.e.:

Ala30Asn+Glu34Ser or A30N+E34S

Ala30Asn Glu34Ser or A30N E34S

representing mutations in positions 30 and 34 substituting alanine andglutamic acid for asparagine and serine, respectively.

Alternatively multiple mutations may be separated by commas orsemicolons, i.e.:

Ala30Asn, Glu34Ser or A30N, E34S

Even more simplified multiple mutations may be separated by a space e.g.

Alternatively multiple mutations may be separated by commas orsemicolons, i.e.:

Ala30Asn Glu34Ser or A30N E34S

When one or more alternative amino acid residues may be inserted in agiven position it is indicated as

A30N,E or

A30N or A30E

Alternatively one or more alternative amino acid residues may beinserted in a given position it is indicated as:

A30 [N, E] or A30 [N E], alternatively A30 {N, E} or A30 {N E}

For simplicity alternative amino acid which could be substituted at acertain position may be indicated as:

A30 N, E, H, L or V

Furthermore, when a position suitable for modification is identifiedherein without any specific modification being suggested, it is to beunderstood that any amino acid residue may be substituted for the aminoacid residue present in the position. Thus, for instance, when amodification of an alanine in position 30 is mentioned, but notspecified, it is to be understood that the alanine may be deleted orsubstituted for any other amino acid, i.e., any one of:

R, N, D, A, C, Q, E, G, H, I, L, K, M, F, P, S, T, W, Y, V.

Further, “A30X” means any one of the following substitutions:

A30R, A30N, A30D, A300, A30Q, A30E, A30G, A30H, A301, A30L, A30K, A30M,A30F, A30P, A30S, A30T, A30W, A30Y, or A30V; or in short:A30R,N,D,C,Q,E,G,H,I,L,K,M,F,P,S,T,W,Y,V.

Or e.g. A30 [R, N, D, C, Q, E, G, H, I, L, K, M, F, P, S, T, W, Y, V]

The skilled person would know that using numbering e.g. according to SEQID NO 6 means using SEQ ID NO: 6 for countering not that the parentnecessarily is SEQ ID NO: 6 but simply that the positions to be alteredare defined according to SEQ ID NO: 6. Therefore, another way ofdescribing the specific substitutions is to indicate the amino acid tobe altered with an X. Thus X30N means that any amino acid present atposition 30 could be substituted with N reflecting that differentalpha-amylase can be used as parent alpha-amylase.

Thus, the nomenclature “X30N” or “X30V” means that any amino acid whichmight be at position 30 in the parent alpha-amylase is substituted by anasparagine or a valine.

Characteristics of Amino Acid Residues

Charged Amino Acids:

Asp, Glu, Arg, Lys, His

Negatively Charged Amino Acids (with the Most Negative Residue First):

Asp, Glu

Positively Charged Amino Acids (with the Most Positive Residue First):

Arg, Lys, His

Neutral Amino Acids:

Gly, Ala, Val, Leu, Ile, Phe, Tyr, Trp, Met, Cys, Asn, Gln, Ser, Thr,Pro

Hydrophobic Amino Acid Residues (with the Most Hydrophobic ResidueListed Last):

Gly, Ala, Val, Pro, Met, Leu, Ile, Tyr, Phe, Trp,

Hydrophilic amino acids (with the most hydrophilic residue listed last):

Thr, Ser, Cys, Gln, Asn

This nomenclature is particularly relevant to modifications involvingsubstituting, inserting or deleting amino acid residues having specificcommon properties. Such modifications are referred to as conservativeamino acid modification(s). Examples of conservative modifications arewithin the group of basic amino acids (arginine, lysine and histidine),acidic amino acids (glutamic acid and aspartic acid), polar amino acids(glutamine and asparagine), hydrophobic amino acids (leucine, isoleucineand valine), aromatic amino acids (phenylalanine, tryptophan andtyrosine), and small amino acids (glycine, alanine, serine, threonineand methionine). Amino acid modifications, which do not generally alterthe specific activity are known in the art and are described, forexample, by H. Neurath and R. L. Hill, 1979, In, The Proteins, AcademicPress, New York. The most commonly occurring exchanges are Ala/Ser,Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Ser/Gly,Tyr/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile, Leu/Val, Ala/Glu, andAsp/Gly as well as the reverse (Taylor, 1986, Journal of TheoreticalBiology 119: 205-218.

Variants of the Invention

In a preferred embodiment the variants comprise alteration(s) in one ormore, or one or several, amino acid residues in the region 193 to 213 ofthe parent alpha-amylase. In a particularly preferred embodiment thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and further analtering at one or more, or one or several, amino acid residues in theregion 193 to 213, wherein the numbering corresponds to the maturepolypeptide of SEQ ID NO: 6, i.e. using numbering according to SEQ IDNO: 6. The inventors have found that such alterations provides variantshaving an increased stability in compositions comprising a chelatingagent, in particular when the chelating agents capable of reducing theconcentration of free calcium ions from 2.0 mM to 0.10 mM at aconcentration below 10 mM, preferably below 9.5 mM, preferably below 9.0mM, preferably below 8.5 mM, preferably below 8.0 mM, preferably below7.5 mM, preferably below 7.0 mM, preferably below 6.5 mM, preferablybelow 6.0 mM, preferably below 5.5 mM, preferably, preferably below 5.0mM, preferably below 4.5 mM, below 4.0 mM, preferably below 3.5 mM,preferably below 3.0 mM, preferably below 2.5 mM, preferably below 2.0mM, preferably below 1.5 mM or preferably below 1.0 mM when measured at21° C. and pH 8.0, as described in the below under “Materials andMethods”.

A first aspect of the invention relates to a composition comprising avariant of a parent alpha-amylase, wherein the variant comprises asubstitution at one or more positions in the range 193 to 213, using thenumbering according to SEQ ID NO: 6, and further comprising at least onechelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0.

A first aspect of the invention relates to a composition comprising avariant of a parent alpha-amylase, wherein the variant comprises asubstitution at one or more positions in the range 193 to 213, using thenumbering according to SEQ ID NO: 6, and further comprising at least onechelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0, and optionally acleaning adjunt.

A second aspect provides a composition comprising a variant of a parentalpha-amylase wherein the variant alpha-amylase comprises an amino acidsequence which is at least 70%, such as at least 75%, such as at least80%, such as at least 85%, such as at least 90%, such as at least 95%,such as at least 100% identical to SEQ ID NO: 6, 8, 10, 12, 18, and 22and further comprises a substitution at one or more positions selectedfrom the group comprising 195, 193, 197, 198, 200, 203, 206, 210, 212213 and 243 using the numbering according to SEQ ID NO: 6, and furthercomprising at least one chelating agent wherein said chelating agent ata concentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0.

A further aspect provides a composition comprising a variant whichcomprises a substitution at one or more positions selected from thegroup comprising 195, 193, 197, 198, 200, 203, 206, 210, 212, 213 and243 (using the numbering according to SEQ ID NO: 6) wherein saidcomposition further comprises at least one chelating agent wherein saidchelating agent at a concentration below 10 mM is capable of reducingthe concentration of free calcium ions from 2.0 mM to 0.10 mM whenmeasured at 21° C. and pH 8.0.

A further aspect provides a composition comprising a variant whichcomprises a substitution at one or more positions selected from thegroup comprising 195, 193, 197, 198, 200, 203, 206, 210, 212, 213 and243 (using the numbering according to SEQ ID NO: 6) and wherein thevariant comprise an amino acid sequence having at least 70% identity toamino acid sequence from the group consisting of SEQ ID NO: 2, 4, 6, 8,10, 12, 14, 16, 18, 20, 22, 24 and 26, preferably SEQ ID NO: 14, 16 or20, preferably SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12,SEQ ID NO: 18, or SEQ ID NO: 22 and wherein said composition furthercomprises at least one chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0.

A further aspect provides a composition comprising a variant whichcomprises a substitution at one or more positions selected from thegroup comprising 195, 193, 197, 198, 200, 203, 206, 210, 212, 213 and243 (using the numbering according to SEQ ID NO: 6) and wherein thevariant comprise an amino acid sequence having at least 70% identity toamino acid sequence from the group consisting of SEQ ID NO: 14, SEQ IDNO: 16 or SEQ ID NO: 20 and wherein said composition further comprisesat least one chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0.

A third aspect relates to a composition wherein the chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured in 80 mMpotassium chloride and 49 mM EPPS at 21° C. and pH 8.0.

A third aspect relates to a composition wherein the chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured in the assaydescribed under “Materials and Methods”.

Thus in a preferred aspect of the invention the variant comprises atleast one substitution at one or more position in the rangecorresponding to positions 193 to 213 of the mature polypeptide of SEQID NO: 6. The terms “using the numbering according to” or “correspondingto” are used interchangeably in the application and refers to thenumbering system used in the present application. Thus position 195 isthe amino acid corresponding to position 195 in SEQ ID NO: 6. Thus it isto be understood that variants of other parent alpha-amylases modifiedin the equivalent position(s) (as determined from the best possibleamino acid sequence alignment between the respective amino acidsequences) are encompassed thereby. When there are deletions thecountering is made as if no deletions were present.

In a particularly preferred embodiment the composition comprises avariant, which variant comprises an altering at one or more positionscorresponding to positions selected from the group consisting of 193,195, 197, 198, 200, 203, 206, 210, 212, 213 and 243 and an altering atone or more positions corresponding to positions selected from the groupconsisting of 116, 118, 129, 133, 134, 142, 146, 147, 149, 151, 152,169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434, 447, 458(using numbering according to SEQ ID NO: 6).

In a particularly preferred embodiment the composition comprises avariant, which variant comprises at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther an alteration at one or more, or one or several, positionscorresponding to positions selected from the group consisting of 193,195, 197, 198, 200, 203, 206, 210, 212, 213 and 243 and an altering atone or more, or one or several, positions corresponding to positionsselected from the group consisting of 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418,431, 434, 447, 458 (using numbering according to SEQ ID NO: 6).

In one aspect of the present invention the composition comprises avariant of a parent alpha-amylase comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises a substitution at one or more, or one orseveral, positions selected from the group consisting of 193, 195, 197,198, 200, 203, 206, 210, 212, 213 and 243, using the numbering accordingto SEQ ID NO: 6, and wherein the variant has an amino acid sequencehaving a degree of identity of at least 70%, preferred at least 75%,preferred at least 80%, preferred at least 81%, preferred at least 82%,preferred at least 83%, preferred at least 84%, preferred at least 85%,preferred at least 86%, preferred at least 87%, preferred at least 88%,preferred at least 89%, especially preferred at least 90%, preferred atleast 91%, preferred at least 92%, preferred at least 93%, preferred atleast 94%, preferred at least 95%, preferred at least 96%, preferred atleast 97%, preferred at least 98%, preferred at least 99% identity tothe amino acid sequence of the parent alpha-amylase, which may be any ofthe sequences with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO: 14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, and wherein the variant has at least 70% residualactivity, preferably at least 75% residual activity, preferably at least80% residual activity, preferably at least 85% residual activity,preferably at least 90% residual activity, preferably at least 95%residual activity, preferably at least 100% residual activity,preferably at least 105% residual activity, preferably at least 110%residual activity or has a residual activity which is at least 5, 10,20, 30, 40, 50, 60, 70, 80, 90, 100 pp improved compared to the residualactivity of the parent alpha-amylase, when the residual activity isdetermined after 18 hours at pH 8 and 31° C. as described in the EnzChekor the PNP-G7 assay (see under “Materials and Methods” for details) inthe presence of a chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0, as described below.

The composition according to the invention preferably comprising analpha-amylase wherein the parent alpha-amylase is modified by at leastone of the following substitutions: position 193 is [G, A, S, T, or M];position 195 is [F, W, Y, L, I, or V]; position 197 is [F, W, Y, L, I,or V]; position 198 is [Q or N]; position 200 is [F, W, Y, L, I, or V];position 203 is [F, W, Y, L, I,or V]; position 206 is [F, W, Y, N, L, I,V, or H]; position 210 is [F, W, Y, L, I,or V]; position 212 is [F, W,Y, L, I, or V] or position 213 is [G, A, S, T, or M] wherein thepositions corresponds to the position of the mature polypeptide with SEQID NO: 6 and further comprising at least one chelating agent whereinsaid chelating agent at a concentration below 10 mM is capable ofreducing the concentration of free calcium ions from 2.0 mM to 0.10 mMwhen measured at 21° C. and pH 8.0, as described under “Materials andMethods”.

The composition according to the invention preferably comprising analpha-amylase variant, wherein the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and wherein the parent alpha-amylase further is modified byat least one of the following substitutions: 193 is [G, A, S, T, or M];position 195 is [F, W, Y, L, I, or V]; position 197 is [F, W, Y, L, I,or V]; position 198 is [Q or N]; position 200 is [F, W, Y, L, I, or V];position 203 is [F, W, Y, L, I, or V]; position 206 is [F, W, Y, N, L,I, V, or H]; position 210 is [F, W, Y, L, I, or V]; position 212 is [F,W, Y, L, I, or V], position 213 is [G, A, S, T, or M] or position 243 is[F, W, Y, L, I or V] wherein the positions corresponds to the positionof the mature polypeptide with SEQ ID NO: 6 and further comprising atleast one chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0, as described under “Materials and Methods”.

In particular the invention concerns a composition comprising analpha-amylase wherein the amino acid sequence is modified by at leastone of the following substitutions: 193 is T; position 195 is F or Y;position 197 is F or L; position 198 is N; position 200 is F; position203 is F; position 206 is F, L or Y; position 210 is Y; position 212 isV; position 213 is A position 243 is F, wherein the positionscorresponds to the position of the mature polypeptide with SEQ ID NO: 6and further comprising at least one chelating agent wherein saidchelating agent at a concentration below 10 mM is capable of reducingthe concentration of free calcium ions from 2.0 mM to 0.10 mM whenmeasured in at 21° C. and pH 8.0, as described under “Materials andMethods”.

In a further aspect the composition comprises an alpha-amylase variant,wherein said variant comprises a substitution at two or more, or two orseveral, positions selected from the group consisting of 193, 195, 197,198, 200, 203, 206, 210, 212, 213 and 243, wherein the positionscorrespond to positions of the mature polypeptide of SEQ ID NO: 6 andfurther comprising at least one chelating agent wherein said chelatingagent at a concentration below 10 mM is capable of reducing theconcentration of free calcium ions from 2.0 mM to 0.10 mM when measuredat 21° C. and pH 8.0, as described under “Materials and Methods”.

In yet a further aspect the composition comprises an alpha-amylasevariant, wherein the variant comprises at least two or more, or at leastthree or more, deletions in amino acid region of 181, 182, 183, or 184and further comprises a substitution at two or more positions selectedfrom the group consisting of 193, 195, 197, 198, 200, 203, 206, 210,212, 213 and 243 wherein the positions correspond to positions of themature polypeptide of SEQ ID NO: 6 and further comprising at least onechelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0, as described under“Materials and Methods”, and wherein the variant has at least 70%residual activity, preferably at least 75% residual activity, preferablyat least 80% residual activity, preferably at least 85% residualactivity, preferably at least 90% residual activity, preferably at least95% residual activity, preferably at least 100% residual activity,preferably at least 105% residual activity, preferably at least 110%residual activity or has a residual activity which is at least 5, 10,20, 30, 40, 50, 60, 70, 80, 90, 100 pp improved compared to the residualactivity of the parent alpha-amylase, when the residual activity isdetermined after 18 hours at pH 8 and 31° C. as described in the EnzChekor the PNP-G7 assay (see under “Materials and Methods” for details) inthe presence of a chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0, as described below.

In preferred embodiments the at least two deletions in amino acid regionof 181, 182, 183, or 184 is selected from the group consisting of181*+182*; 181*+183*, 182*+183*; 181*+184*, 182*+184* and 183*+184*.

In an even further aspect, the composition comprises an alpha-amylasevariant, wherein the variant comprises at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises a substitution at two or more positions selected from thegroup consisting of 193, 195, 197, 198, 200, 203, 206, 210, 212, 213 and243 wherein the positions correspond to positions of the maturepolypeptide of SEQ ID NO: 6 and an altering at one or more, or one orseveral, positions corresponding to positions selected from the groupconsisting of 116, 118, 129, 133, 134, 142, 146, 147, 149, 151, 152,169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434, 447, 458(using numbering according to SEQ ID NO: 6), and further comprising atleast one chelating agent wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH8.0, as described under “Materials and Methods”.

In one aspect of the invention, the composition comprises at least onechelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0 and one or more, orone or several, of the following amylase variants; SP722+R181*G182*N195F; SP722+G182* D183* N195F; SP722+D183* G184* N195F; SP722+R181*G182* N195F M202L; SP722+G182 D183* N195F M202L; SP722+D183* G184* N195FM202L; SP722+D183* G184* N195F V206L Y243F; SP722+D183* G184* N195FV206YY243F; SP722+R181* G182* L118K N195F R458K; SP722+G182* D183* L118KN195F H458K; SP722+D183* G184* L118K N195F H458K; SP722+D183* G184*G133E G149R N195Y Y203F V206L.

AA560+R181* G182* N195F; AA560+G182* D183* N195F; AA560+D183* G184*N195F; AA560+D183* G184* 1206Y; AA560+D183* G184* Y243F; AA560+D183*G184* V206L, Y243F; AA560+D183* G184* N195F V206L; AA560+D183* G184*N195F Y243F; AA560+D183* G184* N195F V206L Y243F; AA560+D183* G184*N195F V206Y Y243F; AA560+R181* G182* N195F M202L; AA560+G182* D183*N195F M202L; AA560+D183* G184* N195F M202L; AA560+R181* G182* R118KN195F R320K R458K; AA560+G182* D183* R118K N195F R320K R458K;AA560+D183* G184* R118K N195F R320K R458K; AA560+D183* G184* R118K N195FI206L R320K R458K; AA560+D183* G184* R118K N195F I206Y R320K R458K;AA560+D183* G184* R118K N195F Y243F R320K R458K; AA560+D183* G184* R118KN195F I206L Y243F R320K R458K.SP707+R181* G182* N195F; SP707+G182* H183* N195F; SP707+H183* G184*N195F; SP707+H183* G184* 1206Y; SP707+H183* G184* N195F I206Y;SP707+H183* G184* N195F Y243F; SP707+H183* G184* I206Y Y243F;SP707+H183* G184* N195F I206LY243F; SP707+H183* G184* N195F I206Y Y243F;SP707+R181* G182* N195F M202L; SP707+G182* H183* N195F M202L;SP707+H183* G184* N195F M202L; SP707+R181* G182* R118K N195F R320KR458K; 5P707+G182* H183* R118K N195F R320K R458K; 5P707+H183* G184*R118K N195F R320K R458K;SP690+R181* G182* N195F; SP690+G182* T183* N195F; SP690+T183* G184*N195F; SP690+H183* G184* V206Y; SP690+H183* G184* N195F V206Y;SP690+H183* G184* N195F Y243F; SP690+H183* G184* V206Y Y243F;SP690+H183* G184* N195F V206L Y243F; SP690+H183* G184* N195F V206YY243F; SP690+R181* G182* N195F M202L; SP690+G182* T183* N195F M202L;SP690+T183* G184* N195F M202L; SP690+R181* G182* R118K N195F R320KR458K; SP690+G182* T183* R118K N195F R320K R458K; SP690+T183* G184*R118K N195F R320K R458K.

In useful embodiments, the composition according to the inventioncomprises an amylase which is a variant of a parent alpha-amylase,wherein the parent alpha-amylase is that of SEQ ID NO:6, and the variantcomprises the deletions D183* and G184* and one of the following sets ofmutations: (a) N195F+H210Y; (b) N195F+V206L,H,Y; (c) N195F+V206L,F+H210Y; (d) N195F+V206Y+Y243F; (e) N195F+Y243F; (f) S193T+V206L; (g)G133E+G149R+N195Y+Y203F+V206L; (h) V206L,Y; (i) Y243F; (j)N195F+V206L+Y243F; (k) N195F; or (I) V206F+Y243F.

Another embodiment of the invention relates to a composition, whereinthe residual activity of the variant is at least 70%, such as at least75%, such as at least 80%, such as at least 85%, such as at least 90%,such as at least 95%, such as at least 100%, such as at least 105%, suchas at least 110%, such as at least 115% residual activity compared tothe parent alpha-amylase in the presence of a chelating agent whereinsaid chelating agent at a concentration below 10 mM, preferably below9.5 mM, preferably below 9 mM, preferably below 8.5 mM, preferably below8 mM, preferably below 7.5 mM, preferably below 7 mM, preferably below6.5 mM, preferably below 6 mM, preferably below 5.5 mM, preferably,preferably below 5 mM, preferably below 4.5 mM, below 4 mM, preferablybelow 3.5 mM, preferably below 3 mM, preferably below 2.5 mM, preferablybelow 2 mM, preferably below 1.5 mM or preferably below 1 mM is capableof reducing the concentration of free calcium ions from 2.0 mM to 0.10mM when measured at 21° C. and pH 8.0, as described under “Materials andMethods” and when residual activity is determined after 18 hours at pH 8at 31° C. as described in the EnzChek or the PNP-G7 assay describedunder “Materials and Methods”.

A further embodiment of the invention relates to a composition, whereinthe residual activity of the variant is at least 5, 10, 20, 30, 40, 50,60, 70, 80, 90, 100 pp improved compared to the residual activity of theparent alpha-amylase in the presence of a chelating agent wherein saidchelating agent at a concentration below 10 mM, preferably below 9.5 mM,preferably below 9 mM, preferably below 8.5 mM, preferably below 8 mM,preferably below 7.5 mM, preferably below 7 mM, preferably below 6.5 mM,preferably below 6 mM, preferably below 5.5 mM, preferably, preferablybelow 5 mM, preferably below 4.5 mM, below 4 mM, preferably below 3.5mM, preferably below 3 mM, preferably below 2.5 mM, preferably below 2mM, preferably below 1.5 mM or preferably below 1 mM is capable ofreducing the concentration of free calcium ions from 2.0 mM to 0.10 mMwhen measured at 21° C. and pH 8.0, as described under “Materials andMethods” and when residual activity is determined after 18 hours at pH 8at 31° C. as described in the EnzChek or the PNP-G7 assay describedunder “Materials and Methods”. The percentage point (pp) improvement inresidual activity of the variant relative to the parent is calculated asthe difference between the residual activity of the variant and that ofthe parent.

Thus in a particular aspect of the invention the composition comprises achelating agent selected from the group consisting of:phosphorous-containing, non-phosphorous containing, carboxylatecontaining, nitrogen containing or non-nitrogen containing chelatingagents, preferred chelating agents are as EDTA, MGDA, EGTA, DTPA, DTPMP,HEDP and mixtures thereof.

In a preferred aspect of the invention the variant comprises asubstitution at one or more positions selected from the group consistingof 195, 193, 197, 198, 200, 203, 206, 210, 212 and 213 wherein thepositions correspond to positions of the mature polypeptide of SEQ IDNO: 6.

In a particularly preferred aspect of the invention the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises asubstitution at one or more positions selected from the group consistingof 195, 193, 197, 198, 200, 203, 206, 210, 212 213 and 243 wherein thepositions correspond to positions of the mature polypeptide of SEQ IDNO: 6. In preferred embodiments the at least two deletions in the aminoacid region of 181, 182, 183, or 184 is selected from the groupconsisting of 181*+182*; 181*+183*, 182*+183*; 181*+184*, 182*+184* and183*+184*.

In another preferred aspect of the invention the variant comprises asubstitution at one or more positions selected from the group consistingof 195, 193, 197, 198, 200, 203, 206, 210, 212, 213 and 243 and furthercomprises a substitution at one or more, or one or several, positionsselected from the group consisting of 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418,431, 434, 447, 458 wherein the positions correspond to positions of themature polypeptide of SEQ ID NO: 6.

In a yet preferred aspect of the invention the variant comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises a substitution atone or more positions selected from the group consisting of 195, 193,197, 198, 200, 203, 206, 210, 212, 213 and 243 and further comprises asubstitution at one or more positions selected from the group consistingof 116, 118, 129, 133, 134, 142, 146, 147, 149, 151, 152, 169, 174, 186,235, 244, 303, 320, 339, 359, 418, 431, 434, 447, 458 wherein thepositions correspond to positions of the mature polypeptide of SEQ IDNO: 6.

In a further aspect the variant comprises a substitution at two or morepositions selected from the group consisting of 116, 118, 129, 133, 134,142, 146, 147, 149, 151, 152, 169, 174, 186, 193, 195, 197, 198, 200,203, 206, 210, 212, 213, 235, 243, 244, 303, 320, 339, 359, 418, 431,434, 447 and 458 wherein the positions correspond to positions of themature polypeptide of SEQ ID NO: 6.

In yet a further aspect the variant comprising at least one, at leasttwo, or at least three deletions in amino acid region of 181, 182, 183,or 184 and further comprises a substitution at two or more positionsselected from the group consisting of 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 193, 195, 197, 198, 200, 203, 206,210, 212, 213, 235, 243, 244, 303, 320, 339, 359, 418, 431, 434, 447 and458 wherein the positions correspond to positions of the maturepolypeptide of SEQ ID NO: 6.

Preferably, the variants comprising alterations at one or more of theabove identified positions have an increased stability in compositionscomprising a chelating agent, e.g. in detergent, preferably in liquiddetergent as compared to the parent alpha-amylase.

Thus, the variants according to the invention have in a preferredembodiment improved stability relative to its parent amylase in thepresence of one or more chelating agents. In a preferred aspect thevariants according to the invention have improved stability relative toits parent amylase in the presence of one or more chelating agents andlow calcium concentration. In yet a preferred aspect the variantsaccording to the invention have improved stability relative to itsparent amylase in presence of a chelating agent wherein said chelatingagent at a concentration below 10 mM is capable of reducing theconcentration of free calcium ions from 2.0 mM to 0.10 mM when measuredat 21° C. and pH 8.0.

In a particular aspect the variant comprising at least one, at leasttwo, or at least three deletions in amino acid region of 181, 182, 183,or 184 and further comprising a substitution at one or more positionselected from the group consisting of 193, 195, 197, 198, 200, 203, 206,210, 212, 213 and 243 and a substitution at one or more positionsselected from the group consisting of 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 338, 359, 418,431, 434, 447 and 458 wherein the positions correspond to positions ofthe mature polypeptide of SEQ ID NO: 6 and wherein the variant furtherhas at least 60%, such as at least 65%, such as at least 70%, such as atleast 75%, such as at least 80%, such as at least 85%, such as at least90%, such as at least 95%, such as at least 100% residual activity inthe presence of a chelating agent wherein said chelating agent at aconcentration below 10 mM, preferably below 9.5 mM, preferably below 9mM, preferably below 8.5 mM, preferably below 8 mM, preferably below 7.5mM, preferably below 7 mM, preferably below 6.5 mM, preferably below 6mM, preferably below 5.5 mM, preferably, preferably below 5 mM,preferably below 4.5 mM, below 4 mM, preferably below 3.5 mM, preferablybelow 3 mM, preferably below 2.5 mM, preferably below 2 mM, preferablybelow 1.5 mM or preferably below 1 mM is capable of reducing theconcentration of free calcium ions from 2.0 mM to 0.10 mM at 21° C. andpH 8.0, as described below, and when residual activity is determinedafter 18 hours at pH 8, at 31° C. as described in the EnzChek assay orthe PNP-G7 assay described under “Materials and Methods”. In preferredembodiments the at least two deletions in the amino acid region of 181,182, 183, or 184 is selected from the group consisting of 181*+182*;181*+183*, 182*+183*; 181*+184*, 182*+184* and 183*+184*.

In a another particular aspect the variant comprises a substitution atone or more positions selected from the group consisting of 193, 195,197, 198, 200, 203, 206, 210, 212, 213 and 243 and further comprising asubstitution at one or more positions selected from the group consistingof 116, 118, 129, 133, 134, 142, 146, 147, 149, 151, 152, 169, 174, 186,235, 244, 303, 320, 339, 359, 418, 431, 434, 447 and 458 wherein thepositions correspond to positions of the mature polypeptide of SEQ IDNO: 6 and wherein the variant further has at least 60%, such as at least65%, such as at least 70%, such as at least 75%, such as at least 80%,such as at least 85%, such as at least 90%, such as at least 95%, suchas at least 100% residual activity or has a residual activity which isat least 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 pp improved comparedto the residual activity of the parent alpha-amylase in the presence ofa chelating agent wherein said chelating agent at a concentration below10 mM, preferably below 9.5 mM, preferably below 9 mM, preferably below8.5 mM, preferably below 8 mM, preferably below 7.5 mM, preferably below7 mM, preferably below 6.5 mM, preferably below 6 mM, preferably below5.5 mM, preferably, preferably below 5 mM, preferably below 4.5 mM,below 4 mM, preferably below 3.5 mM, preferably below 3 mM, preferablybelow 2.5 mM, preferably below 2 mM, preferably below 1.5 mM orpreferably below 1 mM is capable of reducing the concentration of freecalcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0,as described under “Materials and Methods” and when residual activity isdetermined after 18 hours at pH 8 in the presence of DTPA at 31° C. asdescribed in the EnzChek assay or the PNP-G7 assay described under“Materials and Methods”.

The variants according to the invention have the benefit of being morestable towards strong chelating agents relative to their parentalpha-amylase however at the same time they have maintained theperformance properties of the parent alpha-amylase such as washperformance or dish wash performance. In a preferred embodiment thevariants according to the invention have the benefit of being morestable towards chelating agents wherein said chelating agent at aconcentration below 10 mM is capable of reducing the concentration offree calcium ions from 2.0 mM to 0.10 mM when measured in 80 mMpotassium chloride and 49 mM EPPS, at 21° C. and pH 8.0, as describedunder “Materials and Methods”. These preferred chelating agents may beselected from, but are not restricted to, the EDTA, MGDA, EGTA, DTPA,DTPMP HEDP and mixtures thereof.

Thus, the variants of the invention have increased stability in thepresence of chelating agents binding metal ions in particular calciumions compared to their parent alpha-amylase. In detergents it is commonto include chelating agents because of the beneficial effect of thelaundering process, but the increased stability may also be atconditions where plant material including natural chelating agents suchas phytate or citrate is present. In particular a strong chelatingagents will compete with the calcium sensitive alpha-amylases for thecalcium ions and will to some extend be able to deprive thealpha-amylase for the calcium ions bound in their structure with theconsequence that the stability or activity of the alpha-amylase isreduced.

Thus, the variants of the invention have improved stability and/oractivity in the presence of chelating agents, such as EDTA, MGDA, EGTA,DTPA, DTPMP HEDP and mixtures thereof, compared to their parentalpha-amylase.

In addition to increased stability towards chelating agents relative tothe parent alpha-amylase the variants of the present invention haveretained or improved wash performance when compared to the parentalpha-amylase. The improved wash performance can be measured in AMSA orin a wash performance test using beakers as described under “Materialsand Methods”.

Thus, in a particular embodiment of the invention the variant has atleast 60% such as at least 65% residual activity, preferably at least70% residual activity, preferably at least 75% residual activity,preferably at least 80% residual activity, preferably at least 85%residual activity, preferably at least 90% residual activity, preferablyat least 95% residual activity or has a residual activity which is atleast 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 pp improved compared tothe residual activity of the parent alpha-amylase, when the residualactivity is determined after 18 hours at pH 8 and 31° C. as described inthe EnzChek or the PNP-G7 assay (see under “Materials and Methods” fordetails) in the presence of a chelating agent wherein said chelatingagent at a concentration below 10 mM is capable of reducing theconcentration of free calcium ions from 2.0 mM to 0.10 mM when measuredat 21° C. and pH 8.0, as described below and wherein the variant furtherhas at least 40%, such as at least 50%, such as at least 55%, such as atleast 60%, such as at least 65%, such as at least 70%, such as at least75%, such as at least 80%, such as at least 85%, such as at least 90%,such as at least 95%, such as at least 100% improved wash performancecompared to the parent alpha-amylase when measured in AMSA or in a washperformance test using beakers as described under “Materials andMethods”.

In a preferred aspect of the invention the composition comprises avariant having at least 60%, such as at least 65%, such as at least 70%,such as at least 75%, such as at least 80%, such as at least 85%, suchas at least 90%, such as at least 95%, such as at least 100% residualactivity compared to the parent alpha-amylase in the presence of achelating agent wherein said chelating agent at a concentration below 10mM, preferably below 9.5 mM, preferably below 9 mM, preferably below 8.5mM, preferably below 8 mM, preferably below 7.5 mM, preferably below 7mM, preferably below 6.5 mM, preferably below 6 mM, preferably below 5.5mM, preferably, preferably below 5 mM, preferably below 4.5 mM, below 4mM, preferably below 3.5 mM, preferably below 3 mM, preferably below 2.5mM, preferably below 2 mM, preferably below 1.5 mM or preferably below 1mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0, as described inexample 2a and when residual activity is determined after 18 hours at pH8 at 31° C. as described in the EnzChek or the PNP-G7 assay describedunder “Materials and Methods”.

Thus, in a particular aspect of the invention the composition comprisesa chelating agent selected from the group consisting of:phosphorous-containing, non-phosphorous containing, nitrogen containingor non-nitrogen containing chelating agents, preferred chelating agentsare EDTA, MGDA, EGTA, DTPA, DTPMP, HEDP and mixtures thereof.

In a preferred aspect the variants according to the invention have anamino acid sequence having a degree of identity of at least 60%,preferred at least 65%, preferred at least 70%, preferred at least 75%,preferred at least 80%, preferred at least 81%, preferred at least 82%,preferred at least 83%, preferred at least 84%, preferred at least 85%,preferred at least 86%, preferred at least 87%, preferred at least 88%,preferred at least 89%, especially preferred at least 90%, preferred atleast 91%, preferred at least 92%, preferred at least 93%, preferred atleast 94%, preferred at least 95%, preferred at least 96%, preferred atleast 97%, preferred at least 98%, preferred at least 99% identity tothe amino acid sequence of the parent alpha-amylase, which may be any ofthe sequences with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably, SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ IDNO:14, 16 or 20, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect of the present invention, the variants of a parentalpha-amylase comprise a substitution at one or more positions selectedfrom the group consisting of 193, 195, 197, 198, 200, 203, 206, 210, 212213 and 243, using the numbering according to SEQ ID NO: 6, and whereinthe variant have an amino acid sequence having a degree of identity ofat least 60%, preferred at least 65%, preferred at least 70%, preferredat least 75%, preferred at least 80%, preferred at least 81%, preferredat least 82%, preferred at least 83%, preferred at least 84%, preferredat least 85%, preferred at least 86%, preferred at least 87%, preferredat least 88%, preferred at least 89%, especially preferred at least 90%,preferred at least 91%, preferred at least 92%, preferred at least 93%,preferred at least 94%, preferred at least 95%, preferred at least 96%,preferred at least 97%, preferred at least 98%, preferred at least 99%identity to the amino acid sequence of the parent alpha-amylase, whichmay be any of the sequences with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16,18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect of the present invention, the variants of a parentalpha-amylase comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises a substitution at one or more positions selected from thegroup consisting of 193, 195, 197, 198, 200, 203, 206, 210, 212 213 and243, using the numbering according to SEQ ID NO: 6, and wherein thevariant has an amino acid sequence having a degree of identity of atleast 60%, preferred at least 65%, preferred at least 70%, preferred atleast 75%, preferred at least 80%, preferred at least 81%, preferred atleast 82%, preferred at least 83%, preferred at least 84%, preferred atleast 85%, preferred at least 86%, preferred at least 87%, preferred atleast 88%, preferred at least 89%, especially preferred at least 90%,preferred at least 91%, preferred at least 92%, preferred at least 93%,preferred at least 94%, preferred at least 95%, preferred at least 96%,preferred at least 97%, preferred at least 98%, preferred at least 99%identity to the amino acid sequence of the parent alpha-amylase, whichmay be any of the sequences with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16,18, 20, 22, 24 or 26, preferably SEQ ID NO: 14, 16 or 20, preferably SEQID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one further aspect of the present invention, the variant comprises atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises a substitution atone or more positions selected from the group consisting of 193, 195,197, 198, 200, 203, 206, 210, 212, 213 and 243, using the numberingaccording to SEQ ID NO: 6, and wherein the variant has an amino acidsequence having a degree of identity of at least 60%, preferred at least65%, preferred at least 70%, preferred at least 75%, preferred at least80%, preferred at least 81%, preferred at least 82%, preferred at least83%, preferred at least 84%, preferred at least 85%, preferred at least86%, preferred at least 87%, preferred at least 88%, preferred at least89%, especially preferred at least 90%, preferred at least 91%,preferred at least 92%, preferred at least 93%, preferred at least 94%,preferred at least 95%, preferred at least 96%, preferred at least 97%,preferred at least 98%, preferred at least 99% identity to the aminoacid sequence shown in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO:6, 8, 10, 12, 18 or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect of the invention the variant comprises a substitutionat one or more positions 193, 195, 197, 198, 200, 203, 206, 210, 212,213 or 243 and a substitution at one or more positions 116, 118, 129,133, 134, 142, 146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303,320, 339, 359, 418, 431, 434, 447, 458, using the numbering according toSEQ ID NO: 6, and wherein the variant have an amino acid sequence havinga degree of identity of at least 60%, preferred at least 65%, preferredat least 70%, preferred at least 75%, preferred at least 80%, preferredat least 81%, preferred at least 82%, preferred at least 83%, preferredat least 84%, preferred at least 85%, preferred at least 86%, preferredat least 87%, preferred at least 88%, preferred at least 89%, especiallypreferred at least 90%, preferred at least 91%, preferred at least 92%,preferred at least 93%, preferred at least 94%, preferred at least 95%,preferred at least 96%, preferred at least 97%, preferred at least 98%,preferred at least 99% identity to the amino acid sequence of the parentalpha-amylase, which may be any of the sequences with SEQ ID NO: 2, 4,6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16or 20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ IDNO: 6, 8, 10 or 12.

In another aspect of the invention the variant comprising at least one,at least two, or at least three deletions in amino acid region of 181,182, 183, or 184 and further comprises a substitution at one or morepositions 193, 195, 197, 198, 200, 203, 206, 210, 212, 213 or 243 and asubstitution at one or more positions 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418,431, 434, 447, 458, using the numbering according to SEQ ID NO: 6, andwherein the variant have an amino acid sequence having a degree ofidentity of at least 60%, preferred at least 65%, preferred at least70%, preferred at least 75%, preferred at least 80%, preferred at least81%, preferred at least 82%, preferred at least 83%, preferred at least84%, preferred at least 85%, preferred at least 86%, preferred at least87%, preferred at least 88%, preferred at least 89%, especiallypreferred at least 90%, preferred at least 91%, preferred at least 92%,preferred at least 93%, preferred at least 94%, preferred at least 95%,preferred at least 96%, preferred at least 97%, preferred at least 98%,preferred at least 99% identity to the amino acid sequence of the parentalpha-amylase, which may be any of the sequences with SEQ ID NO: 2, 4,6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16or 20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ IDNO: 6, 8, 10 or 12.

In one aspect, the number of amino acid substitutions in the variants ofthe present invention is below 10 substitutions, such as below 9substitutions, such as below 8 substitutions, such as below 7substitutions, such as below 6 substitutions, such as below 5substitutions, such as below 4 substitutions, such as below 3substitutions, such as below 2 substitutions, and/or wherein the numberof deletions is below 10 deletions, such as below 9 deletions, such asbelow 8 deletions, such as below 7 deletions, such as below 6 deletions,such as below 5 deletions, such as below 4 deletions, such as below 3deletions, such as below 2 deletions, such as below 1 deletion or thevariant may comprise no deletions and/or wherein the number ofinsertions is below 10 insertions, such as below 9 insertions, such asbelow 8 insertions, such as below 7 insertions, such as below 6insertions, such as below 5 insertions, such as below 4 insertions, suchas below 3 insertions, such as below 2 insertions, such as below 1insertions or the variant may comprise no insertions compared to theparent alpha-amylase which may be any of the sequences with SEQ ID NO:2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:14, 16 or 20, preferablySEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant comprises a substitution at a positioncorresponding to position 193. In another aspect, the variant comprisesa substitution at a position corresponding to position 193 with [G, A, Tor M] of the mature polypeptide of SEQ ID NO: 6. In one particularembodiment the variant comprises the substitution S193T of the maturepolypeptide of SEQ ID NO: 6. In another aspect, the variant comprisingat least one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises the substitutionS193T, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 195, in a preferred aspect the variantcomprises a substitution at position 195 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises F at position 195, inyet another preferred aspect, the variant comprises the substitutionN195F, wherein the parent is any of the mature polypeptides with SEQ IDNO: 6, 8, 10 or 12. In another aspect, the variant comprises Y as asubstitution at position 195. In another aspect, the variant comprisesthe substitution N195Y, wherein the parent alpha-amylase is any of themature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,22, 24 or 26, preferably SEQ ID NO: 14, 16 or 20, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position195, in a preferred aspect the variant comprises a substitution atposition 195 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises F at position 195, in yet another preferred aspect,the variant comprises the substitution N195F, wherein the parent is anyof the mature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16,18, 20, 22, 24 or 26, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22,preferably SEQ ID NO: 6, 8, 10 or 12. In another aspect, the variantcomprises Y as a substitution at position 195. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitution N195Y, wherein the parent alpha-amylase isany of the mature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14,16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferablySEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 197, in a preferred aspect the variantcomprises a substitution at position 197 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises F at position 197, inyet another preferred aspect, the variant comprises the substitutionN197F, wherein the parent is any of the mature polypeptides with SEQ IDNO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ IDNO:14, 16 or 20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22,preferably SEQ ID NO: 6, 8, 10 or 12. In another aspect, the variantcomprises L as a substitution at position 197. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitution N197L, wherein the parent alpha-amylase isany of the mature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14,16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferablySEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position197, in a preferred aspect the variant comprises a substitution atposition 197 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises F at position 197, in yet another preferred aspect,the variant comprises the substitution N197F, wherein the parent is anyof the mature polypeptides with SEQ ID NO: 6, 8, 10 or 12. In anotheraspect, the variant comprises L as a substitution at position 197. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitution N197L, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 198, in a preferred aspect the variantcomprises a substitution at position 198 with [Q, N, D, E, R, K or H],in another preferred aspect, the variant comprises N at position 198, inyet another preferred aspect, the variant comprises the substitutionY198N, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, 20 or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position198, in a preferred aspect the variant comprises a substitution atposition 198 with [Q, N, D, E, R, K or H], in another preferred aspect,the variant comprises F at position 198, in yet another preferredaspect, the variant comprises the substitution Y198N, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 200, in a preferred aspect the variantcomprises a substitution at position 200 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises F at position 200, inyet another preferred aspect, the variant comprises the substitutionY200F, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position200, in a preferred aspect the variant comprises a substitution atposition 200 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises F at position 200, in yet another preferred aspect,the variant comprises the substitution Y200F, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 203, in a preferred aspect the variantcomprises a substitution at position 203 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises F at position 203, inyet another preferred aspect, the variant comprises the substitutionY203F, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position203, in a preferred aspect the variant comprises a substitution atposition 203 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises F at position 203, in yet another preferred aspect,the variant comprises the substitution Y203F, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 206, in a preferred aspect the variantcomprises a substitution at position 206 with [F, W, Y, N, L, I, V, H,Q, D, or E], in another preferred aspect, the variant comprises F atposition 206, in yet another preferred aspect, the variant comprises Yat position 206, in still another aspect the variant comprises L atposition 206, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one particular embodiment the variant comprises the substitutionV206Y of the mature polypeptide of SEQ ID NO: 6 or 12. In anotherparticular embodiment the variant comprises the substitution I206Y ofthe mature polypeptide of SEQ ID NO: 8 or 10.

In one particular embodiment the variant comprises the substitutionV206F of the mature polypeptide of SEQ ID NO: 6 or 12. In anotherparticular embodiment the variant comprises the substitution I206F ofthe mature polypeptide of SEQ ID NO: 8 or 10.

In one particular embodiment the variant comprises the substitutionV206L of the mature polypeptide of SEQ ID NO: 6 or 12. In anotherparticular embodiment the variant comprises the substitution I206L ofthe mature polypeptide of SEQ ID NO: 8 or 10.

In one particular embodiment the variant comprises the substitutionV206H of the mature polypeptide of SEQ ID NO: 6 or 12. In anotherparticular embodiment the variant comprises the substitution I206H ofthe mature polypeptide of SEQ ID NO: 8 or 10.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position206, in a preferred aspect the variant comprises a substitution atposition 206 with [F, W, Y, N, L, I, V, H, Q, D, or E], in anotherpreferred aspect, the variant comprises F at position 206, in anotherpreferred aspect, the variant comprises Y at position 206.

In one particular embodiment the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitution V206Y of the maturepolypeptide of SEQ ID NO: 6 or 12. In another particular embodiment thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitution I206Y of the mature polypeptide of SEQ ID NO:8 or 10.

In one particular embodiment the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitution V206L of the maturepolypeptide of SEQ ID NO: 6 or 12. In another particular embodiment thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitution I206L of the mature polypeptide of SEQ ID NO:8 or 10.

In one particular embodiment the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitution V206H of the maturepolypeptide of SEQ ID NO: 6 or 12. In another particular embodiment thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitution I206H of the mature polypeptide of SEQ ID NO:8 or 10

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 210, in a preferred aspect the variantcomprises a substitution at position 210 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises Y at position 210, inyet another preferred aspect, the variant comprises the substitutionH210Y, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position210, in a preferred aspect the variant comprises a substitution atposition 210 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises Y at position 210, in yet another preferred aspect,the variant comprises the substitution H210Y, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 212, in a preferred aspect the variantcomprises a substitution at position 212 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises V at position 212, inyet another preferred aspect, the variant comprises the substitutionE212V, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position212, in a preferred aspect the variant comprises a substitution atposition 212 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises V at position 212, in yet another preferred aspect,the variant comprises the substitution E212V, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO: 6, 8, 10,12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 213, in a preferred aspect the variantcomprises a substitution at position 213 with [G, A, S, T or M], inanother preferred aspect, the variant comprises A at position 213, inyet another preferred aspect, the variant comprises the substitutionV213A, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position213, in a preferred aspect the variant comprises a substitution atposition 213 with [G, A, S, T or M], in another preferred aspect, thevariant comprises A at position 213, in yet another preferred aspect,the variant comprises the substitution V213A, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprises asubstitution at position 243, in a preferred aspect the variantcomprises a substitution at position 243 with [F, W, Y, L, I or V], inanother preferred aspect, the variant comprises F at position 243, inyet another preferred aspect, the variant comprises the substitutionY243F, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In one aspect, the variant of a parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises a substitution at position243, in a preferred aspect the variant comprises a substitution atposition 243 with [F, W, Y, L, I or V], in another preferred aspect, thevariant comprises A at position 243, in yet another preferred aspect,the variant comprises the substitution Y243F, wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In another aspect, the variant comprises substitutions at positions 193and 195. In another aspect, the variant comprises substitutions atpositions 193 and 195 with [F, W, Y, L, I, V, N, G, A, T, M or Q]. Inanother aspect, the variant comprises T and F as substitutions atpositions 193 and 195, respectively. In another aspect, the variantcomprises the substitutions S193T+N195F of the mature polypeptide of SEQID NO: 6. In another aspect, the variant comprises T and Y assubstitutions at positions 193 and 195, respectively. In another aspect,the variant comprises the substitutions S193T+N195Y of the maturepolypeptide of SEQ ID NO: 6.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 193 and 195. In another aspect, the variant comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 193 and 195 with [F, W, Y, L, I, V, N, G, A, T, M or Q]. Inanother aspect, the variant comprises T and F as substitutions atpositions 193 and 195, respectively. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions S193T+N195F of the mature polypeptide of SEQ ID NO: 6. Inanother aspect, the variant comprises T and Y as substitutions atpositions 193 and 195, respectively. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions S193T+N195Y of the mature polypeptide of SEQ ID NO: 6.

In another aspect, the variant of a parent alpha-amylase comprises asubstitution at positions 195 and 198, using the numbering of SEQ ID NO:6. In another aspect, the variant comprises a substitution at positions195 and 198 with [F, W, Y, L, I, V, N or Q]. In another aspect, thevariant comprises F and N as substitutions at positions 195 and 198,respectively. In another aspect, the variant comprises the substitutionsN195F+Y198N wherein the parent is any of the mature polypeptides withSEQ ID NO: 6, 8, 10 or 12. In another aspect, the variant comprises Yand N as substitutions at positions 195 and 198, respectively. Inanother aspect, the variant comprises the substitutions N195Y+Y198Nwherein the parent alpha-amylase is any of the mature polypeptides withSEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferablySEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22,preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises a substitution atpositions 195 and 198, using the numbering of SEQ ID NO: 6. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises substitutions at positions 195 and 198 with [F, W, Y,L, I, V, N or Q]. In another aspect, the variant comprises F and N assubstitutions at positions 195 and 198, respectively. In another aspect,the variant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195F+Y198N wherein the parent is any of themature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12. Inanother aspect, the variant comprises Y and N as substitutions atpositions 195 and 198, respectively. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions N195Y+Y198N wherein the parent alpha-amylase is any of themature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprises asubstitution at positions 195 and 206 using numbering according to SEQID NO: 6. In another aspect, the variant comprises a substitution atpositions 195 and 206 with [F, W, Y, V, I, L, C, N, S, T, D, E or H]. Inanother aspect, the variant comprises F and L as substitutions atpositions 195 and 206, respectively. In another aspect, the variantcomprises the substitutions N195F+V206 [F, Y, L, H, or N] of the maturepolypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+I206[F, Y, L, or H] of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y and L as substitutions at 195 and 206, respectively. Inanother aspect, the variant comprises the substitutions N195Y+V206 [F,Y, L, H, or N] of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutions N195Y+I206 [F,Y, L, H, or N] of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195 and 206 using the numbering according to SEQ ID NO: 6. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises substitutions at positions 195 and 206 with [F, W, Y,V, I, L, C, N, S, T, D, E or H]. In another aspect, the variantcomprises F and L as substitutions at positions 195 and 206,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195F+V206[For Y] ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195F+1206 [F, Y, L, H, or N] of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y and L as substitutions at positions 195 and 206,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206 [F, Y, L,H, or N] of the mature polypeptide of SEQ ID NO: 6 or 12. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195Y+I206F of the maturepolypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195 and 210 using the numbering according toSEQ ID NO: 6. In another aspect, the variant comprises a substitution atpositions 195 and 210 with [F, W, Y, V, I, L, C, N, S, T or H]. Inanother aspect, the variant comprises F and Y as substitutions atpositions 195 and 210, respectively. In another aspect, the variantcomprises the substitutions N195F+H210Y wherein the parent is any of themature polypeptides with SEQ ID NO: 6, 8, 10 or 12. In another aspect,the variant comprises Y as substitution at positions 195 and 210. Inanother aspect, the variant comprises the substitutions N195Y+H210Ywherein the parent alpha-amylase is any of the mature polypeptides withSEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferablySEQ ID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22,preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195 and 210 using the numbering according to SEQ ID NO: 6. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises substitutions at positions 195 and 210 with [F, W, Y,V, I, L, C, N, S, T or H]. In another aspect, the variant comprises Fand Y as substitutions at positions 195 and 210, respectively. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+H210Y wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 6, 8,10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12. In anotheraspect, the variant comprises Y as substitution at positionscorresponding to positions 195 and 210. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions N195Y+H210Y wherein the parent alpha-amylase is any of themature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20,22, 24 or 26, preferably SEQ ID NO:14, 16 or 20, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant parent alpha-amylase comprisessubstitutions at positions corresponding to positions 198 and 206 usingnumbering according to SEQ ID NO: 6. In another aspect, the variantcomprises substitutions at positions 198 and 206 with [N, Q, L, I, F, Y,C, N, S, T, D, E or H]. In another aspect, the variant comprises N and[For Y] as substitutions at positions 198 and 206, respectively. Inanother aspect, the variant comprises the substitutions Y198N+V206 [F,Y, L, H, or N] of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutions Y198N+I206 [F,Y, L, H or N] of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant parent alpha-amylase comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises substitutions at positionscorresponding to positions 198 and 206 using numbering according to SEQID NO: 6. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises substitutions at positions 198 and 206with [N, Q, L, 1, F, Y, C, N, S, T, D, E or H]. In another aspect, thevariant comprises N and [For Y] as substitutions at positions 198 and206, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutions Y198N+V206[F, Y, L, H, or N] of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions Y198N+1206 [F, Y, L, H or N] of themature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 206 and 213, using the numbering according toSEQ ID NO: 6. In another aspect, the variant comprises a substitution atpositions 206 and 213 with [D, E, L, 1, V, F, Y, W, G, A, S, T or M]. Inanother aspect, the variant comprises [F or Y] and A as substitutions atpositions 206 and 210, respectively. In another aspect, the variantcomprises the substitutions V206F or Y+V213A of the mature polypeptideof SEQ ID NO: 6 or 12. In another aspect, the variant comprises thesubstitutions 1206 [F, Y, L, H, or N]+V213A of the mature polypeptide ofSEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 206 and 213, using the numbering according to SEQ ID NO: 6.

In another aspect, the variant comprising at least one, at least two, orat least three deletions in amino acid region of 181, 182, 183, or 184and further comprises substitutions at positions 206 and 213 with [D, E,L, 1, V, F, Y, W, G, A, S, T or M]. In another aspect, the variantcomprises [F or Y] and A as substitutions at positions 206 and 210,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions V206 [F, Y, L, H, orN], V213A of the mature polypeptide of SEQ ID NO: 6 or 12. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions 1206 [F, Y, L, H, or N]+V213A of themature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195 and 243 using the numbering according toSEQ ID NO: 6. In another aspect, the variant comprises a substitution atpositions 195 and 243 with [F, W, Y, L, 1 or V]. In another aspect, thevariant comprises F as substitutions at positions 195 and 243,respectively. In another aspect, the variant comprises the substitutionsN195F+Y243F, wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 6, 8, 10 or 12. In another aspect, thevariant comprises Y and F as substitutions at positions 195 and 243,respectively. In another aspect, the variant comprises the substitutionsN195Y+Y243F wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions corresponding to positions 195 and 243. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises substitutions at positions 195 and 243 with [F, W, Y, L, 1 orV]. In another aspect, the variant comprises F as substitutions atpositions 195 and 243, respectively. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions N195F+Y243F wherein the parent alpha-amylase is any of themature polypeptides with SEQ ID NO: 6, 8, 10 or 12. In another aspect,the variant comprises Y and F as substitutions at positions 195 and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+Y243F whereinthe parent alpha-amylase is any of the mature polypeptides with SEQ IDNO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ IDNO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO: 6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 206 and 243 using the numbering according toSEQ ID NO: 6. In another aspect, the variant comprises a substitution atpositions 206 and 243 with [H, D, E, N, F, W, Y, L, I or V]. In anotheraspect, the variant comprises L and F as substitutions at positions 206and 243, respectively. In another aspect, the variant comprises thesubstitutions V206 [F, Y, L, H, or N]+Y243F of the mature polypeptide ofSEQ ID NO: 6 or 12. In another aspect, the variant comprises thesubstitutions V206 [F, Y, L, H, or N]+Y243F of the mature polypeptide ofSEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 206 and 243 using the numbering according to SEQ ID NO: 6. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises substitutions at positions 206 and 243 with [H, D, E,N, F, W, Y, L, I or V]. In another aspect, the variant comprises L and Fas substitutions at positions 206 and 243, respectively. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions V206 [F, Y, L, H, or N]+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprises thesubstitutions V206 [F, Y, L, H, or N]+Y243F of the mature polypeptide ofSEQ ID NO: 8 or 10. In another aspect, the variant of a parentalpha-amylase comprises substitutions at positions 193, 195, and 197using the numbering according to SEQ ID NO: 6. In another aspect, thevariant comprises a substitution at positions 193, 195, and 197 with [F,W, Y, L, I or V]. In another aspect, the variant comprises T and F assubstitutions at positions corresponding to positions 193, 195, and 197,respectively. In another aspect, the variant comprises the substitutionsS193T+N195F+N197F wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ IDNO: 6, 8, 10 or 12. In another aspect, the variant comprises T, F and Las substitutions at positions 193, 195, and 197, respectively. Inanother aspect, the variant comprises the substitutionsS193T+N195F+N197L wherein the parent alpha-amylase is any of the maturepolypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24or 26, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ IDNO: 6, 8, 10 or 12. In another aspect, the variant comprises T, Y and Fas substitutions at positions corresponding to positions 193, 195, and197, respectively. In another aspect, the variant comprises thesubstitutions S193T+N195Y+N197F wherein the parent alpha-amylase is anyof the mature polypeptides with SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16,18, 20, 22, 24 or 26, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22,preferably SEQ ID NO: 6, 8, 10 or 12. In another aspect, the variantcomprises T, Y and L as substitutions at positions corresponding topositions 193, 195, and 197, respectively. In another aspect, thevariant comprises the substitutions S193T+N195Y+N197L wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, 20 or 22, preferably SEQ IDNO: 6, 8, 10 or 12.

In another aspect, the variant comprising at least one, at least two, orat least three deletions in amino acid region of 181, 182, 183, or 184and further comprises substitutions at positions 193, 195, and 197 usingthe numbering according to SEQ ID NO: 6. In another aspect, the variantcomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 and further comprisessubstitutions at positions 193, 195, and 197 with [F, W, Y, L, I or V].In another aspect, the variant comprises T and F as substitutions atpositions 193, 195, and 197, respectively. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions S193T+N195F+N197F wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12. In another aspect, the variant comprises T, F and L assubstitutions at positions 193, 195, and 197, respectively. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions S193T+N195F+N197L, wherein theparent alpha-amylase is any of the mature polypeptides with SEQ ID NO:2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:14, 16 or 20, preferablySEQ ID NO: 6, 8, 10 or 12. In another aspect, the variant comprises T, Yand F as substitutions at positions 193, 195, and 197, respectively. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions S193T+N195Y+N197F wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 6, 8, 10or 12. In another aspect, the variant comprises T, Y and L assubstitutions at positions 193, 195, and 197, respectively. In anotheraspect, the variant comprising at least one, at least two, or at leastthree deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions S193T+N195Y+N197L wherein the parentalpha-amylase is any of the mature polypeptides with SEQ ID NO: 2, 4, 6,8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQ ID NO:14, 16 or20, preferably SEQ ID NO: 6, 8, 10, 12, 18, or 22, preferably SEQ ID NO:6, 8, 10 or 12.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195, 206 and 243 using the numberingaccording to SEQ ID NO: 6. In another aspect, the variant comprisessubstitutions at positions 195, 206 and 243 with [D, E, L, I, F, V, Y,C, N, S, T or H]. In another aspect, the variant comprises F, Y and F assubstitutions at positions 195, 206, and 243, respectively. In anotheraspect, the variant comprises the substitutions N195F+V206Y+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+I206Y+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10. In another aspect, the variant comprises Y, Y andF as substitutions at positions 195, 206, and 243, respectively. Inanother aspect, the variant comprises the substitutionsN195Y+V206Y+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutionsN195Y+I206Y+Y243F of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195, 206 and 243 using the numberingaccording to SEQ ID NO: 6. In another aspect, the variant comprisessubstitutions at positions 195, 206 and 243 with [D, E, L, I, F, V, Y,C, N, S, T or H]. In another aspect, the variant comprises F, L and F assubstitutions at positions 195, 206, and 243, respectively. In anotheraspect, the variant comprises the substitutions N195F+V206L+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+I206L+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10. In another aspect, the variant comprises Y, L andF as substitutions at positions 195, 206, and 243, respectively. Inanother aspect, the variant comprises the substitutionsN195Y+V206L+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutionsN195Y+I206L+Y243F of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195, 206 and 243 using the numberingaccording to SEQ ID NO: 6. In another aspect, the variant comprisessubstitutions at positions 195, 206 and 243 with [D, E, L, I, F, V, Y,C, N, S, T or H]. In another aspect, the variant comprises F, N and F assubstitutions at positions 195, 206, and 243, respectively. In anotheraspect, the variant comprises the substitutions N195F+V206N+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+1206N+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10. In another aspect, the variant comprises Y, N andF as substitutions at positions 195, 206, and 243, respectively. Inanother aspect, the variant comprises the substitutionsN195Y+V206N+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutionsN195Y+1206N+Y243F of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195, 206 and 243 using the numberingaccording to SEQ ID NO: 6. In another aspect, the variant comprisessubstitutions at positions 195, 206 and 243 with [D, E, L, I, F, V, Y,C, N, S, T or H]. In another aspect, the variant comprises F, H and F assubstitutions at positions 195, 206, and 243, respectively. In anotheraspect, the variant comprises the substitutions N195F+V206H+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+I206H+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10. In another aspect, the variant comprises Y, H andF as substitutions at positions 195, 206, and 243, respectively. Inanother aspect, the variant comprises the substitutionsN195Y+V206H+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutionsN195Y+I206H+Y243F of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprisessubstitutions at positions 195, 206 and 243 using the numberingaccording to SEQ ID NO: 6. In another aspect, the variant comprisessubstitutions at positions 195, 206 and 243 with [D, E, L, I, F, V, Y,C, N, S, T or H]. In another aspect, the variant comprises F, F and F assubstitutions at positions 195, 206, and 243, respectively. In anotheraspect, the variant comprises the substitutions N195F+V206F+Y243F of themature polypeptide of SEQ ID NO: 6 or 12. In another aspect, the variantcomprises the substitutions N195F+I206F+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10. In another aspect, the variant comprises Y, F andF as substitutions at positions 195, 206, and 243, respectively. Inanother aspect, the variant comprises the substitutionsN195Y+V206F+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprises the substitutionsN195Y+I206F+Y243F of the mature polypeptide of SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195, 206 and 243, using the numbering according to SEQ ID NO:6. In another aspect, the variant comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises substitutions at positions 195, 206 and 243with [D, E, L, I, F, V, Y, C, N, S, T or H]. In another aspect, thevariant comprises F, Y and F as substitutions at positions 195, 206, and243, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutionsN195F+V206Y+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+I206Y+Y243F of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y, Y and F as substitutions at positions 195, 206, and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206Y+Y243F ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195Y+I206Y+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195, 206 and 243, using the numbering according to SEQ ID NO:6. In another aspect, the variant comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises substitutions at positions 195, 206 and 243with [D, E, L, I, F, V, Y, C, N, S, T or H]. In another aspect, thevariant comprises F, L and F as substitutions at positions 195, 206, and243, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutionsN195F+V206L+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+I206L+Y243F of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y, L and F as substitutions at positions 195, 206, and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206L+Y243F ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195Y+I206L+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195, 206 and 243, using the numbering according to SEQ ID NO:6. In another aspect, the variant comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises substitutions at positions 195, 206 and 243with [D, E, L, I, F, V, Y, C, N, S, T or H]. In another aspect, thevariant comprises F, N and F as substitutions at positions 195, 206, and243, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutionsN195F+V206N+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+I206N+Y243F of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y, N and F as substitutions at positions 195, 206, and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206N+Y243F ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195Y+1206N+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195, 206 and 243, using the numbering according to SEQ ID NO:6. In another aspect, the variant comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises substitutions at positions 195, 206 and 243with [D, E, L, I, F, V, Y, C, N, S, T or H]. In another aspect, thevariant comprises F, H and F as substitutions at positions 195, 206, and243, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutionsN195F+V206H+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+I206H+Y243F of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y, H and F as substitutions at positions 195, 206, and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206H+Y243F ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195Y+I206H+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10.

In another aspect, the variant of a parent alpha-amylase comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184 and further comprises substitutions atpositions 195, 206 and 243, using the numbering according to SEQ ID NO:6. In another aspect, the variant comprising at least one, at least two,or at least three deletions in amino acid region of 181, 182, 183, or184 and further comprises substitutions at positions 195, 206 and 243with [D, E, L, I, F, V, Y, C, N, S, T or H]. In another aspect, thevariant comprises F, F and F as substitutions at positions 195, 206, and243, respectively. In another aspect, the variant comprising at leastone, at least two, or at least three deletions in amino acid region of181, 182, 183, or 184 and further comprises the substitutionsN195F+V206F+Y243F of the mature polypeptide of SEQ ID NO: 6 or 12. Inanother aspect, the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther comprises the substitutions N195F+I206F+Y243F of the maturepolypeptide of SEQ ID NO: 8 or 10. In another aspect, the variantcomprises Y, F and F as substitutions at positions 195, 206, and 243,respectively. In another aspect, the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and further comprises the substitutions N195Y+V206F+Y243F ofthe mature polypeptide of SEQ ID NO: 6 or 12. In another aspect, thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and furthercomprises the substitutions N195Y+I206F+Y243F of the mature polypeptideof SEQ ID NO: 8 or 10.

In one aspect of the invention the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and one or more of the following substitutions N195 [F orY], N197 [F or L], Y198N, Y200F, Y203F, 1206 [H, L, N, F, or Y], H210Y,E212 [V or G], V213A and a substitution at one or more positions M116T,Q129L, G133E, E134Y, K142R, P146S, G147E, G149R, N151R, Y152H, Q169E,N174R, G186R, Y243F, S244Q, G303V, R320N, R359I, N418D, A447V of themature polypeptide sequence of SEQ ID NO: 10 or an amino acid sequencehaving a degree of identity of at least 60%, preferred at least 65%,preferred at least 70%, preferred at least 75% preferred at least 80%,preferred at least 81%, preferred at least 82%, preferred at least 83%,preferred at least 84% preferred at least 85%, preferred at least 86%,preferred at least 87%, preferred at least 88%, preferred at least 89%,especially preferred at least 90%, especially preferred at least 91%,especially preferred at least 92%, especially preferred at least 93%,especially preferred at least 94%, even especially more preferred atleast 95% homology, more preferred at least 96%, more preferred at least97%, more preferred at least 98%, more preferred at least 99% to theamino acid sequence with SEQ ID NO: 10.

In another aspect of the invention the variant comprising at least one,at least two, or at least three deletions in amino acid region of 181,182, 183, or 184 and one or more of the following substitutions N195 [For Y], N197 [F or L], Y198N, Y200F, Y203F, 1206 [F, Y, L, H, or N],H210Y, E212 [V or G], V213A and a substitution at one or more positionsM116T, Q129L, G133E, E134Y, P146S, G147E, G149R, T151R, Y152H, Q169E,N174R, A186R, Y243F, S244Q, G303V, R320N, R359I, N418D, A447V of themature polypeptide sequence of SEQ ID NO: 8 or an amino acid sequencehaving a degree of identity of at least 60%, preferred at least 65%,preferred at least 70%, preferred at least 75% preferred at least 80%,preferred at least 81%, preferred at least 82%, preferred at least 83%,preferred at least 84% preferred at least 85%, preferred at least 86%,preferred at least 87%, preferred at least 88%, preferred at least 89%,especially preferred at least 90%, especially preferred at least 91%,especially preferred at least 92%, especially preferred at least 93%,especially preferred at least 94%, even especially more preferred atleast 95% homology, more preferred at least 96%, more preferred at least97%, more preferred at least 98%, more preferred at least 99% to theamino acid sequence with SEQ ID NO: 8.

In one aspect of the invention the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and one or more of the following substitutions N195 [F orY], N197 [F or L], Y198N, Y200F, Y203F, V206 [F, Y, L, H, or N], H210Y,E212 [V or G], V213A, or Y243F and a substitution at one or morepositions 1116T, Q129L, G133E, E134Y, K142R, P146S, G147E, G149R, N151R,Y152H, Q169E, Q174R, A186R, S244Q, G303V, K320N, R359I, N418D, A447V ofthe mature polypeptide sequence of SEQ ID NO: 6 or an amino acidsequence having a degree of identity of at least 60%, preferred at least65%, preferred at least 70%, preferred at least 75% preferred at least80%, preferred at least 81%, preferred at least 82%, preferred at least83%, preferred at least 84% preferred at least 85%, preferred at least86%, preferred at least 87%, preferred at least 88%, preferred at least89%, especially preferred at least 90%, especially preferred at least91%, especially preferred at least 92%, especially preferred at least93%, especially preferred at least 94%, even especially more preferredat least 95% homology, more preferred at least 96%, more preferred atleast 97%, more preferred at least 98%, more preferred at least 99% tothe amino acid sequence with SEQ ID NO: 6.

In one aspect of the invention the variant comprising at least one, atleast two, or at least three deletions in amino acid region of 181, 182,183, or 184 and one or more of the following substitutions N195 [F orY], N197 [F or L], Y198N, Y200F, Y203F, V206 [F, Y, L, H, or N], H210Y,E212 [V or G], V213A or Y243F and a substitution at one or morepositions 1116T, Q129L, G133E,

E134Y, K142R, P146S, G147E, G149R, N151R, Y152H, Q169E, Q174R, A186R,S244Q, G303V, K320N, R359I, N418D, A447V of the mature polypeptidesequence of SEQ ID NO: 12 or an amino acid sequence having a degree ofidentity of at least 60%, preferred at least 65%, preferred at least70%, preferred at least 75% preferred at least 80%, preferred at least81%, preferred at least 82%, preferred at least 83%, preferred at least84% preferred at least 85%, preferred at least 86%, preferred at least87%, preferred at least 88%, preferred at least 89%, especiallypreferred at least 90%, especially preferred at least 91%, especiallypreferred at least 92%, especially preferred at least 93%, especiallypreferred at least 94%, even especially more preferred at least 95%homology, more preferred at least 96%, more preferred at least 97%, morepreferred at least 98%, more preferred at least 99% to the amino acidsequence with SEQ ID NO: 12.

Thus one aspect of the invention concern variants of a parentalpha-amylase comprising an alteration at one or more positions selectedfrom the group consisting of 195, 197, 198, 200, 203, 206, 210, 212, 213and 243 and further comprising an alteration at one or more positionsselected from the group consisting of 116, 118, 129, 133, 134, 142, 146,147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 359, 418, 431,434, 447 and 458 wherein

(a) the alteration(s) are independently

-   -   (i) an insertion of an amino acid immediately downstream of the        position,    -   (ii) a deletion of the amino acid which occupies the position,        and/or    -   (iii) a substitution of the amino acid which occupies the        position,        (b) the variant has alpha-amylase activity; and        (c) each position corresponds to a position of the amino acid        sequence of the enzyme having the amino acid sequence of SEQ ID        NO:6.

Thus one aspect of the invention concern variants of a parentalpha-amylase comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and analteration at one or more positions selected from the group consistingof 195, 197, 198, 200, 203, 206, 210, 212, 213, 243 and furthercomprising an alteration at one or more positions selected from thegroup consisting of 116, 118, 129, 133, 134, 142, 146, 147, 149, 151,152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434, 447 and458 wherein

(a) the alteration(s) are independently

-   -   (i) an insertion of an amino acid immediately downstream and        adjacent of the position, (ii) a deletion of the amino acid        which occupies the position, and/or    -   (iii) a substitution of the amino acid which occupies the        position,        (b) the variant has alpha-amylase activity; and        (c) each position corresponds to a position of the amino acid        sequence of the enzyme having the amino acid sequence of SEQ ID        NO:6.

Preferably the variant comprises an amino acid sequence which has adegree of identity of at least 70%, preferably at least 75%, morepreferably at least 80%, more preferably at least 85%, even morepreferably at least 90%, most preferably at least 95%, and even mostpreferably at least about 97% to the amino acid sequence of one of SEQID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 or 26, preferably SEQID NO:14, 16 or 20, preferably SEQ ID NO: 6, 8, 10, 12, 14, 16, 18, 22,or 20.

Preferably, the variants comprising alterations at one or more of theabove identified positions have an increased stability in compositionscomprising a chelating agent such as industrial compositions, e.g.detergent, preferably in liquid detergent as compared to the parentalpha-amylase.

The inventors have found that these variants have an improved stabilityrelative to the parent alpha-amylase in compositions comprising achelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM, at 21° C. and pH 8.0, as described under “Materialsand Methods”.

Thus another aspect the invention relates to a method for preparing apolypeptide comprising;

-   -   (a) providing an amino acid sequence of a parent polypeptide        having amylase activity;    -   (b) selecting one or more amino acid which occupies one or more        position corresponding to positions 195, 197, 198, 200, 203,        206, 210, 212, 213, 243, and further selecting one or more        position corresponding to positions 116, 118, 129, 133, 134,        142, 146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320,        339, 359, 418, 431, 434, 447, 458 of the mature polypeptide of        SEQ ID NO: 6;    -   (c) modifying the sequence by substituting or deleting the        selected amino acid residue or inserting one or more amino acid        residues downstream and adjacent to the selected amino acid        residue;    -   (d) producing a variant polypeptide having the modified        sequence;    -   (e) testing the variant polypeptide for amylase activity and        stability; and    -   (f) selecting a variant polypeptide having amylase activity and        increased stability relative to the parent polypeptide in the        presence of a chelating agent wherein said chelating agent at a        concentration below 10 mM is capable of reducing the        concentration of free calcium ions from 2.0 mM to 0.10 mM at        21° C. and pH 8.0.

Preferably the variants comprises alterations at three positions, morepreferred four positions even more preferred five positions and mostpreferred six positions, in a particularly preferred embodiment thevariant comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184 and further oneor more substitution at one or more positions corresponding to positionsin the parent alpha-amylase selected from the group consisting of 193,195, 197, 198, 200, 203, 206, 210, 212, 213, 243 (using numberingaccording to SEQ ID NO: 6).

Thus a preferred aspect relates to a variant of a parent alpha-amylasecomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184 an alteration at one or morepositions selected from the group consisting of 195, 197, 198, 200, 203,206, 210, 212, 213, 243 and further comprising an alteration at one ormore positions selected from the group consisting of 116, 118, 129, 133,134, 142, 146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320,339, 359, 418, 413, 434, 447, 458 wherein

(a) the alteration(s) are independently

-   -   (i) an insertion of an amino acid immediately downstream and        adjacent of the position,    -   (ii) a deletion of the amino acid which occupies the position,        and/or    -   (iii) a substitution of the amino acid which occupies the        position,        (b) the variant has alpha-amylase activity; and        (c) each position corresponds to a position of the amino acid        sequence of the enzyme having the amino acid sequence of SEQ ID        NO:6.

In a preferred embodiment the variant alpha-amylase have one or more(several) amino acid deletions and/or substitutions and/or insertions.In a particularly preferred embodiment the variant alpha-amylasesinclude an alpha-amylase, which has the amino acid sequence shown in SEQID NO: 6 herein and which further comprise the following alteration:D183*+G184* (deletion at position 183 and 184), this variant show goodperformance in detergents and have improved stability in the presence ofchelating agents.

In a preferred embodiment the variant alpha-amylase comprises SP707 (SEQID NO: 8) including any of SP707+R181* G182*, SP707+G182* H183*,SP707+H183* G184*.

In another preferred embodiment the variant alpha-amylase comprisesSP722 (SEQ ID NO: 6) including any of SP722+R181* G182*, SP722+G182*D183*, SP722+D183* G184*.

In yet another preferred embodiment the variant alpha-amylase comprisesAA560 (SEQ ID NO: 10) including any of AA560+R181* G182*, AA560+G182*D183*, AA560+D183* G184*.

In another preferred embodiment the parent alpha-amylase comprises SP690(SEQ ID NO: 12) including any of SP690+R181* G182*; SP690+G182* T183*;SP690+T183* G184*.

“SP722+R181* G182* means the Bacillus spp. alpha-amylase SP722 has beenmutated by deletions in positions R181 and G182 wherein the numberingcorresponds to SEQ.ID NO: 6.

Thus in one aspect of the invention the variant alpha-amylase comprisesany one of the following: SP722, SP690, SP707 or AA560 including any of:

SP722+R181*G182*, SP722+G182*+D183*, SP722+D183*+G184*; SP722+R181*G182*N195F; SP722+G182* D183* N195F; SP722+D183* G184* N195F;SP722+R181*G182* M202L; SP722+G182* D183* M202L; SP722+D183* G184*M202L; SP722+R181* G182* N195F M202L; SP722+G182 D183* N195F M202L;SP722+D183* G184* N195F M202L; SP722+D183* G184* N195F V206LY243F;SP722+D183* G184* N195F V206YY243F SP722+D183* G184* N195F V206F Y243F;SP722+R181* G182* R181Q; SP722+G182* D183* R181Q; SP722+D183* G184*R181Q; SP722+R181* G182* L118K N195F H458K; SP722+G182* D183* L118KN195F H458K; SP722+D183* G184* L118K N195F H458K; SP722+D183* G184*G133E G149R N195Y Y203F V206L.AA560+R181* G182*, AA560+G182* D183*, AA560+D183* G184*; AA560+R181*G182* N195F; AA560+G182* D183* N195F; AA560+D183* G184* N195F;AA560+D183* G184* 1206Y; AA560+D183* G184* Y243F; AA560+D183* G184*I206L Y243F; AA560+D183* G184* N195F I206L; AA560+D183* G184* N195FY243F; AA560+D183* G184* N195F I206L, Y243F; AA560+D183* G184* N195FI206Y Y243F; AA560+D183* G184* N195F I206F; AA560+R181* G182* M202L;AA560+G182* D183* M202L; AA560+D183* G184* M202L; AA560+R181* G182*N195F M202L; AA560+G182* D183* N195F M202L; AA560+D183* G184* N195FM202L; AA560+R181* G182* R118K N195F R320K T458K; AA560+G182* D183*R118K N195F R320K T458K; AA560+D183* G184* R118K N195F R320K T458K;AA560+D183* G184* R118K N195F I206L R320K R458K; AA560+D183* G184* R118KN195F I206Y R320K R458K; AA560+D183* G184* R118K N195F Y243F R320KR458K; AA560+D183* G184* R118K N195F I206L Y243F R320K R458K.SP707+R181* G182*, SP707+G182* H183*, SP707+H183* G184*; SP707+R181*G182* N195F; SP707+G182* H183* N195F; SP707+H183* G184* N195F I206L,Y243F; SP707+H183* G184* N195F I206Y Y243F; SP707+H183* G184* N195FI206F Y243F; SP707+H183* G184* N195F; SP707+R181* G182* M202L;SP707+G182* H183* M202L; SP707+D183* G184* M202L; SP707+R181* G182*N195F M202L; SP707+G182* H183* N195F M202L; SP707+H183* G184* N195FM202L; SP707+R181* G182* R181Q; SP707+G182* H183* R181Q; SP707+H183*G184* R181Q; SP707+R181* G182* R118K N195F R320K R458K; SP707+G182*H183* R118K N195F R320K R458K; SP707+H183* G184* R118K N195F R320KR458K;SP690+R181* G182*, SP690+G182* T183*, SP690+T183* G184*; SP690+R181*G182* N195F; SP690+G182* T183* N195F; SP690+T183* G184* N195F;SP690+T183* G184* N195F V206L, Y243F; SP690+T183* G184* N195F V206YY243F; SP690+T183* G184* N195F V206F Y243F SP690+R181* G182* M202L;SP690+G182* T183* M202L; SP690+T183* G184* M202L; SP690+R181* G182*N195F M202L; SP690+G182* T183* N195F M202L; SP690+T183* G184* N195FM202L; SP690+R181* G182* R118K N195F R320K R458K; SP690+G182* T183*R118K N195F R320K R458K; SP690+T183* G184* R118K N195F R320K R458K.

“SP722+R181* G182* N195F” means the Bacillus spp. alpha-amylase SP722has been mutated as follows: deletions in positions R181 and G182 and asubstitution from Asn (N) to Phe (F) in position 195 wherein thenumbering corresponds to SEQ.ID NO: 6 (Counting as if the deletedpositions are still present i.e. the numbering does not shift down bytwo when deleting two positions).

In a particular preferred embodiment of the invention the alterationsare selected from the following substitutions:

X193A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably S193T;

X195A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably N195 [For Y];

X197A, C, D, E, F, G, H, I, K, L, N, P, Q, R, S, T, V, W, X, Y,preferably N197 [F or L];

X198A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably Y198N;

X200A, C, D, E, F, G, H, I, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably Y200F;

X203A, C, D, E, F, G, H, I, K, L, M, N, P, Q, R, T, V, W, X, Y,preferably Y203F.

X206A, C, D, E, F, G, H, I, K, L, N, P, Q, R, S, T, V, W, X, Y,preferably V206 [F, Y, L, H, or N];

X210A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably H210Y;

X212A, C, D, E, F, G, H, I, L, M, N, P, Q, R, S, T, V, W, X, Y,preferably E212 [V or G]; and

X213A, C, D, E, F, G, H, I, K, L, M, N, P, Q, R, T, V, W, X, Y,preferably V213A.

X243A, C, D, E, F, G, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyY243F

In another preferred embodiment the variants comprises alterations atthree positions, more preferred four positions, more preferred fivepositions and more preferred six positions, in a particularly preferredembodiment the variant comprising at least one, at least two, or atleast three deletions in amino acid region of 181, 182, 183, or 184 andfurther an altering at one or more positions corresponding to positionsselected from the group consisting of 193, 195, 197, 198, 200, 203, 206,210, 212, 213, 243 and an altering at one or more positionscorresponding to positions selected from the group consisting of 116,129, 133, 142, 146, 147, 149, 151, 152, 169, 174, 186, 244, 303, 320,359, 418, 447 (using numbering according to SEQ ID NO: 6).

Thus in a particular preferred embodiment of the invention thealterations are selected from the following substitutions:

X116A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyN116T

X118A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyR118K

X129A, C, D, E, F, G, H, I, K, L, M, N, P, Q, S, T, V, W, Y, preferablyQ129L

X133A, C, D, E, F, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyG133E

X134A, C, D, E, F, G, H, I, L, M, N, P, Q, R, S, T, V, W, Y, preferablyD134Y

X142A, C, D, E, F, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyK142R

X146A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyP146S

X147A, C, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, W, Y, preferablyG147E

X149A, C, D, E, F, G, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyG149R

X151A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyT151R

X152A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyY152H

X169A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyQ169E

X174C, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyQ174R

X186A, C, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, W, Y, preferablyA186R

X235A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferably1235N

X244A, C, D, E, F, G, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyS244Q

X303A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyG303V

X320A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyK320N

X339A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyS339P

X359C, D, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y, preferablyR359I

X418A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyN418D

X431A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyS431T

X434A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyP434T

X447A, C, E, F, G, H, I, K, L, M, N, P, Q, R, S, T, V, W, Y,preferablyA447V

X458A, C, D, E, F, G, H, I, K, L, M, P, Q, R, S, T, V, W, Y, preferablyR458K

In a particular preferred embodiment the variant further comprising atleast one, at least two, or at least three deletions in amino acidregion of 181, 182, 183, or 184.

In a preferred embodiment, the number of amino acid substitutions in thevariants of the present invention is preferably 17 substitutions, morepreferably 16 substitutions, more preferably 15 substitutions, morepreferably 14 substitutions, more preferably 13 substitutions, morepreferably 12 substitutions, more preferably 11 substitutions, morepreferably 10 substitutions, more preferably 9 substitutions, morepreferably 8 substitutions, more preferably 7 substitutions, morepreferably 6 substitutions, more preferably 5 substitutions, morepreferably 4 substitutions, even more preferably 3 substitutions, andmost preferably 2 substitution. In another preferred embodiment, thenumber of amino acid substitutions in the variants of the presentinvention consists of preferably 17 substitutions, more preferably 16substitutions, more preferably 15 substitutions, more preferably 14substitutions, more preferably 13 substitutions, more preferably 12substitutions, more preferably 11 substitutions, more preferably 10substitutions, more preferably 9 substitutions, more preferably 8substitutions, more preferably 7 substitutions, more preferably 6substitutions, more preferably 5 substitutions, more preferably 4substitutions, even more preferably 3 substitutions, and most preferably2 substitution.

In particular preferred embodiment the variants according to the presentinvention comprises a combinations of different alterations. Thus in anpreferred embodiment the variant according to the present inventioncomprising at least one, at least two, or at least three deletions inamino acid region of 181, 182, 183, or 184, preferably deletion atposition 183 and 184 and further comprises one of the followingcombinations of alterations substitutions at positions 186 and 195;substitutions at positions 174 and 212; substitutions at positions 206and 212; substitutions at positions 206, 212 and 304; substitutions atpositions 206, 212, 304 and 447; substitutions at positions 116 and 133;substitutions at positions 235 and 339; substitutions at positions 193and 206; substitutions at positions 116, 133 and 142; substitutions atpositions 116, 133, 142 and 198; substitutions at positions 116, 133,142, 198 and 206; substitutions at positions 133 and 195; substitutionsat positions 133, 195 and 198; substitutions at positions 133, 195, 198and 200; substitutions at positions 116 and 195; substitutions atpositions 116, 195 and 198; substitutions at positions 142 and 146;substitutions at positions 142, 146 and 149; substitutions at positions142, 146, 149 and 195; substitutions at positions 142, 146, 149, 195 and198; substitutions at positions 142, 146, 149, 195, 198 and 206;substitutions at positions 151 and 210; substitutions at positions 151,210 and 320; substitutions at positions 186, 195, 212 and 213;substitutions at positions 151, 210, 320 and 359; substitutions atpositions 151, 210, 320, 359 and 418; substitutions at positions 147 and149; substitutions at positions 147, 149 and 169; substitutions atpositions 147, 149, 169 and 198; substitutions at positions 147, 149,169, 198 and 203; substitutions at positions 147, 149, 169, 198, 203 and206; substitutions at positions 133 and 149; substitutions at positions133, 149 and 195; substitutions at positions 133, 149, 195 and 198;substitutions at positions 133, 149, 195, 198 and 203; substitutions atpositions 147 and 152; substitutions at positions 147, 152 and 169;substitutions at positions 147, 152, 169 and 198; substitutions atpositions 147, 152, 169, 198 and 206; substitutions at positions 195 and206; substitutions at positions 195 and 243; substitutions at positions195 and 210; substitutions at positions 206 and 210; substitutions atpositions 186 and 195; substitutions at positions 195 and 206;substitutions at positions 195, 206 and 243; substitutions at positions206 and 243; substitutions at positions 133 and 149; substitutions atpositions 133, 149 and 198; substitutions at positions 133, 149, 198 and206; substitutions at positions 116 and 133; substitutions at positions116, 133 and 147; substitutions at positions 116, 133, 147 and 152;substitutions at positions 116, 133, 147, 152 and 198; substitutions atpositions 116, 133, 147, 152, 198 and 203; substitutions at positions116, 133, 147, 152, 198, 203 and 206; substitutions at positions 147 and149; substitutions at positions 147, 149 and 195; substitutions atpositions 147, 149, 195 and 198; substitutions at positions 147, 149,195, 198 and 206; substitutions at positions 133 and 142; substitutionsat positions 133, 142 and 195; substitutions at positions 133, 142, 195and 198; substitutions at positions 133 and 149; substitutions atpositions 133, 149 and 152; substitutions at positions 133, 149, 152 and195; substitutions at positions 133, 149, 152, 195 and 198;substitutions at positions 133, 149, 152, 195, 198 and 206;substitutions at positions 116 and 129; substitutions at positions 116,129 and 142; substitutions at positions 116, 129, 142 and 195;substitutions at positions 116, 129, 142, 195 and 198; substitutions atpositions 116, 129, 142, 195, 198 and 203; substitutions at positions116, 129, 142, 195, 198, 203 and 206; substitutions at positions 133 and149; substitutions at positions 133, 149 and 152; substitutions atpositions 133, 149, 152 and 195; substitutions at positions 133, 149,152, 195 and 198; substitutions at positions 133, 149, 152, 195, 198 and203; substitutions at positions 133, 149, 152, 195, 198, 203 and 206;substitutions at positions 116 and 133; substitutions at positions 116,133 and 149; substitutions at positions 116, 133, 149 and 198;substitutions at positions 116, 133, 149, 198 and 203; substitutions atpositions 116, 133, 149, 198, 203 and 206; substitutions at positions195 and 198; substitutions at positions 195, 198 and 203; substitutionsat positions 195, 198, 203 and 206; substitutions at positions 133, 149,195, 203, and 206.

In another particular preferred embodiment the variants according to thepresent invention comprises a combinations of different alterations.Thus in an preferred embodiment the variant according to the presentinvention comprising at least one, at least two, or at least threedeletions in amino acid region of 181, 182, 183, or 184, preferablydeletion at position 183 and 184 and further comprises one of thefollowing combinations of alterations substitutions at positions 186with [R, T, K, H, E, D, Q, or N] and 195 with [F, W, Y, L, I, or oV];substitutions at positions 174 with [R, K, H, E, D, Q, or N] and 212with [F, W, Y, L, I, or V]; substitutions at positions 206 with [D, E,F, W, Y, L, I, V, N, Q, or H] and 212 with [F, W, Y, L, I, or V];substitutions at positions 206 with [F, W, Y, L, I, V, N, Q, or H], 212with [F, W, Y, L, I, or V] and 304 with [F, W, Y, L, I, or V];substitutions at positions 206 with [F, W, Y, L, I, V, N, Q, or H], 212with [F, W, Y, L, I, or V], 304 with [F, W, Y, L, I, or V] and 447 with[F, W, Y, L, I, or V]; substitutions at positions 116 with [G, A, S, T,or M] and 133 with [E or D]; substitutions at positions 235 with [N orL] and 339 with [P]; substitutions at positions 193 with [G, A, T or M]and 206 with [F, W, Y, L, I, V, N, Q, or H]; substitutions at positions116 with [G, A, S, T, or M], 133 with [E or D] and 142 with [R, K, H, Q,or N]; substitutions at positions 116 with [G, A, S, T, or M], 133 with[E or D], 142 with [R, K, H, Q, or N] and 198 with [Q or N];substitutions at positions 116 with [G, A, S, T, or M], 133 with [E orD], 142 with [R, K, H, Q, or N], 198 with [Q or N] with [Q or N] and 206with [F, W, Y, L, I, V, N, Q, or H]; substitutions at positions 133 with[E or D] and 195 with [F, W, Y, L, I, or V]; substitutions at positions133 with [E or D], 195 with [F, W, Y, L, I, or V] and 198 with [Q or N];substitutions at positions 186 with [R, T, K, H, E, D, Q, or N], 195,with [F, W, Y, L, I, or V], 212 with [F, W, Y, L, I, or V] and 213; with[A]; substitutions at positions 133 with [E or D], 195 with [F, W, Y, L,I, or V], 198 with [Q or N] and 200 with [F, W, Y, L, I, or V];substitutions at positions 116 with [G, A, S, T, or M] and 195 with [F,W, Y, L, I, or V]; substitutions at positions 116 with [G, A, S, T, orM], 195 with [F, W, Y, L, I, or V] and 198 with [Q or N]; substitutionsat positions 142 with [R, K, H, Q, or N] and 146 with [G, A, S, T, orM]; substitutions at positions 142 with [R, K, H, Q, or N], 146 with [G,A, S, T, or M] and 149 with [R, K, H, Q, or N]; substitutions atpositions 142 with [R, K, H, Q, or N], 146 with [G, A, S, T, or M], 149with [R, K, H, Q, or N] and 195 with [F, W, Y, L, I, or V];substitutions at positions 142 with [R, K, H, Q, or N], 146 with [G, A,S, T, or M], 149 with [R, K, H, Q, or N], 195 with [F, W, Y, L, I, or V]and 198 with [Q, or N]; substitutions at positions 142 with [R, K, H, Q,or N], 146 with [G, A, S, T, or M], 149 with [R, K, H, Q, or N], 195with [F, W, Y, L, I, or V], 198 with [Q, N] and 206 with [F, W, Y, L, I,V, N, Q, or H]; substitutions at positions 151 with [R] and 210 with [F,W, Y, L, I, or V]; substitutions at positions 151 with [R], 210 with [F,W, Y, L, I, or V] and 320 with [Q, or N]; substitutions at positions 151with [R], 210 with [F, W, Y, L, I, or V], 320 with [Q, N] and 359 with[F, W, Y, L, I, or V]; substitutions at positions 151 with [R], 210 with[F, W, Y, L, I, or V], 320 with [Q, or N], 359 with [F, W, Y, L, I, orV] and 418 with [E, or D]; substitutions at positions 147 with [E, or D]and 149 with [R, K, H, Q, or N]; substitutions at positions 147 with [E,or D], 149 with [R, K, H, Q, or N] and 169 with [E, or D]; substitutionsat positions 147 with [E, or D], 149 with [R, K, H, Q, or N], 169 with[E, or D] and 198 with [Q, or N]; substitutions at positions 147 with[E, or D], 149 with [R, K, H, Q, or N], 169 with [E, or D], 198 with [Q,or N] and 203 with [F, W, Y, L, I, or V]; substitutions at positions 147with [E, or D], 149 with [R, K, H, Q, or N], 169 with [E, or D], 198with [Q, or N], 203 with [F, W, Y, L, I, or V] and 206 with [F, W, Y, L,I, V, N, Q, or H]; substitutions at positions 133 with [E, or D] and 149with [R, K, H, Q, or N]; substitutions at positions 133 with [E, or D],149 with [R, K, H, Q, or N] and 195 with [F, W, Y, L, I, or V];substitutions at positions 133 with [E, or D], 149 with [R, K, H, Q, orN], 195 with [F, W, Y, L, I, or V] and 198 with [Q, or N]; substitutionsat positions 133 with [E, or D], 149 with [R, K, H, Q, or N], 195 with[F, W, Y, L, I, or V], 198 with [Q, or N] and 203 with [F, W, Y, L, I,or V]; substitutions at positions 147 with [E, or D] and 152 with [R, K,H, Q, or N]; substitutions at positions 147 with [E, or D], 152 with [R,K, H, Q, or N] and 169 with [E, or D]; substitutions at positions 147with [E, or D], 152 with [R, K, H, Q, or N], 169 with [E, or D] and 198with [Q, or N]; substitutions at positions 147 with [E, or D], 152 with[R, K, H, Q, or N], 169 with [E, or D], 198 with [Q, or N] and 206 with[F, W, Y, L, I, V, N, Q, or H]; substitutions at positions 195 with [F,W, Y, L, I, or V] and 206 with [F, W, Y, L, I, V, N, Q, or H];substitutions at positions 195 with [F, W, Y, L, I, or V] and 243 with[F, W, Y, L, I, or V]; substitutions at positions 195 with [F, W, Y, L,I, or V] and 210 with [F, W, Y, L, I, or V]; substitutions at positions206 with [F, W, Y, L, I, V, N, Q, or H] and 210 with [F, W, Y, L, I, orV]; substitutions at positions 186 with [R, T, K, H, E, D, Q, or N] and195 with [F, W, Y, L, I, or V]; substitutions at positions 195 with [F,W, Y, L, I, or V] and 206 with [F, W, Y, L, I, V, N, Q, or H];substitutions at positions 195 with [F, W, Y, L, I, or V], 206 and 243with [F, W, Y, L, I, or V]; substitutions at positions 206 and 243 with[F, W, Y, L, I, or V]; substitutions at positions 133 with [E, or D] and149 with [R, K, H, Q, or N]; substitutions at positions 133 with [E, orD], 149 with [R, K, H, Q, or N] and 198 with [Q, or N]; substitutions atpositions 133 with [E, or D], 149 with [R, K, H, Q, or N], 198 with [Q,or N] and 206; substitutions at positions 116 with [G, A, S, T, or M]and 133 with [E, or D]; substitutions at positions 116 with [G, A, S, T,or M], 133 with [E, or D] and 147 with [E, or D]; substitutions atpositions 116 with [G, A, S, T, or M], 133 with [E, or D], 147 with [E,or D] and 152 with [R, K, H, Q, or N]; substitutions at positions 116with [G, A, S, T, or M], 133 with [E, or D], 147 with [E, or D], 152with [R, K, H, Q, or N] and 198 with [Q, or N]; substitutions atpositions 116 with [G, A, S, T, or M], 133 with [E, or D], 147 with [E,or D], 152 with [R, K, H, Q, or N], 198 with [Q, or N] and 203 with [F,W, Y, L, I, or V]; substitutions at positions 116 with [G, A, S, T, orM], 133 with [E, or D], 147 with [E, or D], 152 with [R, K, H, Q, or N],198 with [Q, or N], 203 with [F, W, Y, L, I, or V] and 206;substitutions at positions 147 with [E, or D] and 149 with [R, K, H, Q,or N]; substitutions at positions 147 with [E, or D], 149 with [R, K, H,Q, or N] and 195 with [F, W, Y, L, I, or V]; substitutions at positions147 with [E, or D], 149 with [R, K, H, Q, or N], 195 with [F, W, Y, L,I, or V] and 198 with [Q, or N]; substitutions at positions 147 with [E,or D], 149 with [R, K, H, Q, or N], 195 with [F, W, Y, L, I, or V], 198with [Q, or N] and 206; substitutions at positions 133 with [E, or D]and 142 with [R, K, H, Q, or N]; substitutions at positions 133 with [E,or D], 142 with [R, K, H, Q, or N] and 195 with [F, W, Y, L, I, or V];substitutions at positions 133 with [E, or D], 142 with [R, K, H, Q, orN], 195 with [F, W, Y, L, I, or V] and 198 with [Q, or N]; substitutionsat positions 133 with [E, or D] and 149 with [R, K, H, Q, or N];substitutions at positions 133 with [E, or D], 149 with [R, K, H, Q, orN] and 152 with [R, K, H, Q, or N]; substitutions at positions 133 with[E, or D], 149 with [R, K, H, Q, or N], 152 with [R, K, H, Q, or N] and195 with [F, W, Y, L, I, or V]; substitutions at positions 133 with [E,or D], 149 with [R, K, H, Q, or N], 152 with [R, K, H, Q, or N], 195with [F, W, Y, L, I, or V] and 198 with [Q, or N]; substitutions atpositions 133 with [E, or D], 149 with [R, K, H, Q, or N], 152 with [R,K, H, Q, or N], 195 with [F, W, Y, L, I, or V], 198 with [Q, or N] and206; substitutions at positions 116 with [G, A, S, T, or M] and 129 with[F, W, Y, L, I, or V]; substitutions at positions 116 with [G, A, S, T,or M], 129 with [F, W, Y, L, I, or V] and 142 with [R, K, H, Q, or N];substitutions at positions 116 with [G, A, S, T, or M], 129 with [F, W,Y, L, I, or V], 142 with [R, K, H, Q, or N] and 195 with [F, W, Y, L, I,or V]; substitutions at positions 116 with [G, A, S, T, or M], 129 with[F, W, Y, L, I, or V], 142 with [R, K, H, Q, or N], 195 with [F, W, Y,L, I, or V] and 198 with [Q, or N]; substitutions at positions 116 with[G, A, S, T, or M], 129 with [F, W, Y, L, I, or V], 142 with [R, K, H,Q, or N], 195 with [F, W, Y, L, I, or V], 198 with [Q, or N] and 203with [F, W, Y, L, I, or V]; substitutions at positions 116 with [G, A,S, T, or M], 129 with [F, W, Y, L, I, or V], 142 with [R, K, H, Q, orN], 195 with [F, W, Y, L, I, or V], 198 with [Q, or N], 203 with [F, W,Y, L, I, or V] and 206; substitutions at positions 133 with [E, or D]and 149 with [R, K, H, Q, or N]; substitutions at positions 133 with [E,or D], 149 with [R, K, H, Q, or N] and 152 with [R, K, H, Q, or N];substitutions at positions 133 with [E, or D], 149 with [R, K, H, Q, orN], 152 with [R, K, H, Q, or N] and 195 with [F, W, Y, L, I, or V];substitutions at positions 133 with [E, or D], 149 with [R, K, H, Q, orN], 152 with [R, K, H, Q, or N], 195 with [F, W, Y, L, I, or V] and 198with [Q, or N]; substitutions at positions 133 with [E, or D], 149 with[R, K, H, Q, or N], 152 with [R, K, H, Q, or N], 195 with [F, W, Y, L,I, or V], 198 with [Q, or N] and 203 with [F, W, Y, L, I, or V];substitutions at positions 133 with [E, or D], 149 with [R, K, H, Q, orN], 152 with [R, K, H, Q, or N], 195 with [F, W, Y, L, I, or V], 198with [Q, or N], 203 with [F, W, Y, L, I, or V] and 206; substitutions atpositions 116 with [G, A, S, T, or M] and 133 with [E, or D];substitutions at positions 116 with [G, A, S, T, or M], 133 with [E, orD] and 149 with [R, K, H, Q, or N]; substitutions at positions 116 with[G, A, S, T, or M], 133 with [E, or D], 149 with [R, K, H, Q, or N] with[R, K, H, Q, or N] and 198 with [Q, or N]; substitutions at positions116 with [G, A, S, T, or M], 133 with [E, or D], 149 with [R, K, H, Q,or N], 198 with [Q, or N] and 203 with [F, W, Y, L, I, or V];substitutions at positions 116 with [G, A, S, T, or M], 133 with [E, orD], 149 with [R, K, H, Q, or N], 198 with [Q, or N], 203 with [F, W, Y,L, I, or V] and 206; substitutions at positions 195 with [F, W, Y, L, I,or V] and 198 with [Q, or N]; substitutions at positions 195 with [F, W,Y, L, I, or V], 198 with [Q, or N] and 203 with [F, W, Y, L, I, or V];substitutions at positions 195 with [F, W, Y, L, I, or V], 198 with [Q,or N], 203 with [F, W, Y, L, I, or V] and 206 with [F, W, Y, L, I, V, N,Q, or H]; substitutions at positions 133 with [E, or D], 149 with [R, K,H, Q, or N], 195 with [F, W, Y, L, I, or V], 203 with [F, W, Y, L, I, orV], and 206 with [F, W, Y, L, I, V, N, Q, or H].

Particular useful variants according to the invention includes (usingthe numbering of SEQ ID NO: 6): D183* G184* N195L; D183* G184* N197F;D183* G184* N197L; D183* G184* Y243F; D183* G184* N195F, D183* G184*N277F; D183* G184* 5431T; D183* G184* P434T; D183* G184* 1235N S339P;D183* G184* L351F; D183* G184* A186R, N195F; D183* G184* H210Y; D183*G184* V206Y; D183* G184* V206L; D183* G184* V206F; D183* G184* V213AQ174R; D183* G184* E212V; D183* G184* V206F E212G G304V A447V; N116TG133E K142R D183* G184* Y198N V206Y; G133E D183* G184* N195Y Y198NY200F; D183* G184* A186D N195F E212V V213A; N116T D183* G184* N195YY198N; K142R P146S G149K D183* G184* N195YY198N V2061; D134Y D183*G184*; T151R D183* G184* H210Y K320N R359I N418D Q490H; G147E G149RQ169E D183* G184* Y198N Y203F V206Y; G133E G149R D183* G184* N195Y Y198NY203F V206Y; G147E Y152H Q169E D183* G184* Y198N V206Y; D183* G184*N195F V206Y; D183* G184* N195F V206L; D183* G184* N195F V206F; D183*G184* V206L Y243F; D183* G184* V206F Y243F; D183* G184* N195F Y243F;D183* G184* N195F H210Y; D183* G184* V206Y H210Y; D183* G184* V213A;D183* G184* S193T; D183* G184* A186T N195F; D183* G184* N195F V206YY243F; D183* G184* N195F V206L Y243F; D183* G184* N195F V206Y Y243F;D183* G184* N195F V206F Y243F; D183* G184* V206Y Y243F; D183* G184*N195Y; G133D G149R D183* G184* Y198N V206Y; N116T G133E G147E Y152HD183* G184* Y198N Y203F V206Y; G147E G149R D183* G184* N195F Y198NV206Y; G133E K142R D183* G184* N195F Y198N; G133E G149R Y152H D183*G184* N195Y Y198N V206Y; N116T Q129L K142R D183* G184* N195Y Y198N Y203FV206Y; G133E G149R Y152H D183* G184* N195Y Y198N Y203F V206Y; N116TG133E G149R G182* D183* Y198N Y203F V206Y, D183* G184* S193T V206L,D183* G184* G133E G149R N195Y Y203F V206L

In a preferred embodiment variants according to the invention includes,SP722SP722+D183* G184* N195L; SP722SP722+D183* G184* N197F;SP722SP722+D183* G184* N197L; SP722SP722+D183* G184* Y243F;SP722SP722+D183* G184* N195F, SP722SP722+D183* G184* N277F; SP722+D183*G184* S431T; SP722+D183* G184* P434T; SP722+D183* G184* 1235N S339P;SP722+D183* G184* L351F; SP722+D183* G184* A186D N195F E212V V213A;SP722+D183* G184* A186R N195F; SP722+D183* G184* H210Y; SP722+D183*G184* V206Y; SP722+D183* G184* V206L, SP722+D183* G184* V206F;SP722+D183* G184* V213A Q174R; SP722+D183* G184* E212V; SP722+D183*G184* V206Y E212G G304V A447V; SP722+N116T G133E K142R D183* G184* Y198NV206Y; SP722+G133E D183* G184* N195Y Y198N Y200F; SP722+N116T D183*G184* N195YY198N; SP722+K142R P146S G149K D183* G184* N195YY198N V2061;SP722+D134Y D183* G184*; SP722+T151R D183* G184* H210Y K320N R359IN418D; SP722+G147E G149R Q169E D183* G184* Y198N Y203F V206Y;SP722+G133E G149R D183* G184* N195Y Y198N Y203F V206Y; SP722+G147E Y152HQ169E D183* G184* Y198N V206Y; SP722+D183* G184* N195F V206Y;SP722+D183* G184* N195F V206F; SP722+D183* G184* N195F V206L;SP722+D183* G184* I206L Y243F; SP722+D183* G184* 1206F Y243F;SP722+D183* G184* N195F Y243F; SP722+D183* G184* N195F H210Y;SP722+D183* G184* V206Y H210Y; SP722+D183* G184* V213A; SP722+D183*G184* S193T; SP722+D183* G184* A186T N195F; SP722+D183* G184* N195FV206Y Y243F; SP722+D183* G184* V206Y Y243F; SP722+D183* G184* N195Y;SP722+G133D G149R D183* G184* Y198N V206Y; SP722+N116T G133E G147E Y152HD183* G184* Y198N Y203F V206Y; SP722+G147E G149R D183* G184* N195F Y198NV206Y; SP722+G133E K142R D183* G184* N195F Y198N; SP722+G133E G149RY152H D183* G184* N195Y Y198N V206Y; SP722+N116T Q129L K142R D183* G184*N195Y Y198N Y203F V206Y; SP722+G133E G149R Y152H D183* G184* N195Y Y198NY203F V206Y; SP722+N116T G133E G149R G182* D183* Y198N Y203F V206Y,SP722+D183* G184* G133E G149R N195Y Y203F V206L.

In one preferred embodiment the variants are selected from thefollowing: SP722+D183* G184* N195F V206L Y243F; SP722+D183* G184* N195FV206Y Y243F; SP722+D183* G184* N195F V206N Y243F; SP722+D183* G184*N195F V206F Y243F; SP722+D183* G184* N195F V206H; SP722+D183* G184*N195F V206Y; SP722+D183* G184* V206F Y243F; SP722+D183* G184* N195FV206L H210Y; SP722+D183* G184* S193T V206L; SP722+D183* G184* G133EG149R N195Y Y203F V206L.

In another preferred embodiment variants according to the inventionincludes, SP707+H183* G184* N195L; SP707+H183* G184* N197F; SP707+H183*G184* N197L; SP707+H183* G184* Y243F; SP707+H183* G184* N195F,SP707+H183* G184* N277F; SP707+H183* G184* A186D N195F E212V V213A;SP707+H183* G184* S431T; SP707+H183* G184* A434T; SP707+H183* G184*I235N A339P; SP707+H183* G184* L351F, SP707+H183* G184* A186R, N195F;SP707+H183* G184* H210Y; SP707+H183* G184* 1206Y; SP707+H183* G184*I206L, SP707+H183* G184* I206F; SP707+H183* G184* V213A Q174R;SP707+H183* G184* E212V; SP707+H183* G184* I206Y E212G G304V A447V;SP707+M116T G133E H183* G184* Y198N I206Y; SP707+G133E H183* G184* N195YY198N Y200F; SP707+M116T H183* G184* N195Y Y198N; SP707+P146S G149KH183* G184* N195Y Y198N V2061; SP707+E134Y H183* G184*; SP707+T151RH183* G184* H210Y R320N R359I N418D; SP707+G147E G149R Q169E H183* G184*Y198N Y203F I206Y; SP707+G133E G149R H183* G184* N195Y Y198N Y203FI206Y; SP707+G147E Q169E H183* G184* Y198N I206Y; SP707+H183* G184*N195F I206Y; SP707+H183* G184* N195F I206L; SP707+H183* G184* N195FI206F; SP707+H183* G184* N195F Y243F; SP707+H183* G184* N195F H210Y;SP707+H183* G184* 1206Y H210Y; SP707+H183* G184* V213A; SP707+H183*G184* S193T; SP707+H183* G184* A186T N195F; SP707+H183* G184* N195FI206Y Y243F; SP707+H183* G184* N195F I206F Y243F; SP707+H183* G184*N195F I206L Y243F; SP707+H183* G184* N195F I206Y Y243F SP707+H183* G184*1206Y Y243F; SP707+H183* G184*I206L Y243F; SP707+H183* G184*I206F Y243F;SP707+H183* G184* N195Y; SP707+G133D G149R H183* G184* Y198N I206Y;SP707+M116T G133E G147E H183* G184* Y198N Y203F I206Y; SP707+G147EG149R+H183* G184* N195F Y198N I206Y; SP707+G133E H183* G184* N195FY198N; SP707+G133E G149R H183* G184* N195Y Y198N I206Y; SP707+M116TQ129L H183* G184* N195Y Y198N Y203F I206Y; SP707+G133E G149R H183* G184*N195Y Y198N Y203F I206Y; SP707+M116T G133E G149R G182* H183* Y198N Y203FI206Y; SP707+D183* G184* R118K N195F R320K R458K; SP707+D183* G184*R118K N195F I206L R320K R458K; SP707+D183* G184* R118K N195F I206Y R320KR458K; SP707+D183* G184* R118K N195F Y243F R320K R458K; SP707+D183*G184* R118K N195F I206L Y243F R320K R458K.

In a preferred embodiment variants according to the invention includes,AA560+D183* G184* N195L; AA560+D183* G184* N197F; AA560+D183* G184*N197L; AA560+D183* G184* Y243F; AA560+D183* G184* N195F, AA560+D183*G184* N277F; AA560+D183* G184* S431T; AA560+D183* G184* A434T;AA560+D183* G184* I235N A339P; AA560+D183* G184* L351F; D183* G184*G186D N195F E212V V213A AA560+D183* G184* G186R, N195F; AA560+D183*G184* H210Y; AA560+D183* G184* 1206Y; AA560+D183* G184* I206L;AA560+D183* G184* 1206F; AA560+D183* G184* V213A Q174R; AA560+D183*G184* E212V; AA560+D183* G184* 1206Y E212G G304V A447V; AA560+M116TG133E K142R D183* G184* Y198N I206Y; AA560+G133E D183* G184* N195Y Y198NY200F; AA560+M116T D183* G184* N195Y Y198N; AA560+K142R P146S G149KD183* G184* N195Y Y198N12061; AA560+E134Y D183* G184*; AA560+T151R D183*G184* H210Y R320N R359I N418D; AA560+G147E G149R Q169E D183* G184* Y198NY203F I206Y; AA560+G133E G149R D183* G184* N195Y Y198N Y203F I206Y;AA560+G147E Y152H Q169E D183* G184* Y198N I206Y; AA560+D183* G184* N195FI206Y; AA560+D183* G184* N195F I206L; AA560+D183* G184* N195F I206F;AA560+D183* G184* I206L Y243F; AA560+D183* G184* 1206F Y243F;AA560+D183* G184* N195F Y243F; AA560+D183* G184* N195F H210Y;AA560+D183* G184* 1206Y H210Y; AA560+D183* G184* V213A; AA560+D183*G184* S193T; AA560+D183* G184* G186T N195F; AA560+D183* G184* N195FI206Y Y243F, AA560+D183* G184* N195F I206L Y243F; AA560+D183* G184*N195F I206Y Y243F AA560+D183* G184* I206Y Y243F; AA560+D183* G184* I206LY243F; AA560+D183* G184* N195Y; AA560+G133D G149R D183* G184* Y198NI206Y; AA560+M116T G133E G147E Y152H D183* G184* Y198N Y203F I206Y;AA560+G147E G149R D183* G184* N195F Y198N I206Y; AA560+G133E K142R D183*G184* N195F Y198N; AA560+G133E G149R Y152H D183*G184*N195YY198NI206Y;AA560+M116TQ129L K142R D183*G184* N195Y Y198N Y203F I206Y; AA560+G133EG149R Y152H D183* G184* N195Y Y198N Y203F I206Y; AA560+M116T G133E G149RG182* D183* Y198N Y203F I206Y; AA560+D183* G184* R118K N195F R320KR458K; AA560+D183* G184* R118K N195F I206L R320K R458K; AA560+D183*G184* R118K N195F I206Y R320K R458K; AA560+D183* G184* R118K N195F Y243FR320K R458K; AA560+D183* G184* R118K N195F I206L Y243F R320K R458K.

In a preferred embodiment variants according to the invention includes,

SP690+T183* G184* N195L; SP690+T183* G184* N197F; SP690+T183* G184*N197L; SP690+T183* G184* Y243F; SP690+T183* G184* N195F, SP690+T183*G184* N277F; SP690+T183* G184* S431T; SP690+T183* G184* P434T;SP690+T183* G184* I235N A339P; SP690+T183* G184* L351F; SP690+T183*G184* A186D N195F E212V V213A; SP690+T183* G184* A186R N195F;SP690+T183* G184* H210Y; SP690+T183* G184* V206Y; SP690+T183* G184*V206L, SP690+T183* G184* V206F; SP690+T183* G184* V213A Q174R;SP690+T183* G184* E212V; SP690+T183* G184* V206Y E212G G304V A447V;SP690+N116T G133E K142R T183* G184* Y198N V206Y; SP690+G133E T183* G184*N195Y Y198N Y200F; SP690+N116T T183* G184* N195Y Y198N; SP690+K142RP146S G149K T183* G184* N195Y Y198N V2061; SP690+E134Y T183* G184*;SP690+N151R T183* G184* H210Y K320N R359I N418D; SP690+G147E G149R Q169ET183* G184* Y198N Y203F V206Y; SP690+G133E G149R T183* G184* N195Y Y198NY203F V206Y; SP690+G147E Y152H Q169E T183* G184* Y198N V206Y;SP690+T183* G184* N195F V206Y; SP690+T183* G184* N195F V206F;SP690+T183* G184* N195F V206L; SP690+T183* G184* I206L Y243F;SP690+T183* G184* I206F Y243F; SP690+T183* G184* N195F Y243F;SP690+T183* G184* N195F H210Y; SP690+T183* G184* V206Y H210Y;SP690+T183* G184* V213A; SP690+T183* G184* S193T; SP690+T183* G184*A186T N195F; SP690+T183* G184* N195F V206Y Y243F; SP690+T183* G184*V206Y Y243F; SP690+T183* G184* N195Y; SP690+G133D G149R T183* G184*Y198N V206Y; SP690+N116T G133E G147E Y152H T183* G184* Y198N Y203FV206Y; SP690+G147E G149R T183* G184* N195F Y198N V206Y; SP690+G133EK142R T183* G184* N195F Y198N; SP690+G133E G149R Y152HT183*G184*N195YY198N V206Y; SP690+N116TQ129L K142R T183*G184*N195Y Y198NY203F V206Y; SP690+G133E G149R Y152H T183* G184* N195Y Y198N Y203FV206Y; SP690+N116T G133E G149R G182* T183* Y198N Y203F V206Y,SP690+T183* G184* G133E G149R N195Y Y203F V206L, SP690+T183* G184* R118KN195F R320K R458K; 5P690+T183* G184* N118K N195F V206L R320K R458K;5P690+T183* G184* N118K N195F V206Y R320K R458K; SP690+T183* G184* N118KN195F Y243F R320K R458K; SP690+T183* G184* N118K N195F V206L Y243F R320KR458K; SP690+T183* G184* N195F V206L Y243F; SP690+T183* G184* N195FV206Y Y243F; SP690+T183* G184* N195F V206N Y243F; SP690+T183* G184*N195F V206F Y243F; SP690+T183* G184* N195F V206H; SP690+T183* G184*N195F V206Y; SP690+T183* G184* V206F Y243F; SP690+T183* G184* N195FV206L H210Y; SP690+T183* G184* S193T V206L; SP690+T183* G184* G133EG149R N195Y Y203F V206L.

In a preferred embodiment, variants according to the invention includesa variant of a parent alpha-amylase, wherein the parent alpha-amylase isthat of SEQ ID NO:6, and the variant comprises the deletions D183* andG184* and one of the following sets of mutations: (a) N195F+H210Y; (b)N195F+V206L,H,Y; (c) N195F+V206L, F+H210Y; (d) N195F+V206Y+Y243F; (e)N195F+Y243F; (f) S193T+V206L; (g) G133E+G149R+N195Y+Y203F+V206L; (h)V206L,Y; (i) Y243F; (j) N195F+V206L+Y243F; (k) N195F; or (1)V206F+Y243F.

Detergent Compositions: According to the invention, the abovealpha-amylase variants may typically be a component of a detergentcomposition, e.g., a laundry detergent composition or a dishwashingdetergent composition. In a special embodiment of the invention thecomposition further comprises a strong chelating agent or complexingagent. Thus one aspect of the invention concerns a compositioncomprising a variant of a parent alpha-amylase comprising a substitutionat one or more position in the range corresponding to positions 193 to213 of the mature polypeptide of SEQ ID NO: 6 and further comprising achelating agent wherein said chelating agent at a concentration below 10mM is capable of reducing the concentration of free calcium ions from2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0, as described under“Materials and Methods”.

In another embodiment the composition comprises a chelating agentselected from, but not limited, to the following: The chelating agentmay contain an amino group and may be, e.g., an amino-polycarboxylate ora phosphonate. It may be a monomeric molecule comprising one, two orthree amino groups (typically secondary or tertiary amino groups), andit may contain two, three, four or five or even more carboxyl groups.Chelating agents may be but are not limited to the following:ethylene-diamine-tetra-acetic acid (EDTA), diethylene triamine pentamethylene phosphonic acid (DTPMP), hydroxy-ethane diphosphonic acid(HEDP), ethylenediamine N,N′-disuccinic acid (EDDS), methyl glycinedi-acetic acid (MGDA), diethylene triamine penta acetic acid (DTPA),propylene diamine tetracetic acid (PDTA), 2-hydroxypyridine-N-oxide(HPNO), or ethylenedinitrilotertrakis (methylenephosphonic acid)N,N,-dioxide, methyl glycine diacetic acid (MGDA), glutamic acidN,N-diacetic acid (N,N-dicarboxymethyl glutamic acid tetrasodium salt,(GLDA) and nitrilotriacetic acid (NTA) or mixtures thereof. Thechelating agents are typically present at a level of from 0.1% to 75% byweight in a detergent.

The detergent composition of the present invention may further comprisea cleaning/detergent adjunt, which is not a chelating agent as definedabove, preferably comprising a mixture of components. Typically thecleaning adjunct will be present in the composition in an amount from0.001 to 99.9 wt %, more typically from 0.01 to 80 wt % cleaningadjunct. Suitable cleaning adjuncts comprise: surfactants, builders,bleaches, bleach catalysts, colorants, bleach boosters, dye transferagents, deposition aids, dispersants, additional enzymes, and enzymestabilizers, catalytic materials, bleach activators, hydrogen peroxide,sources of hydrogen peroxide, optical brighteners, photoactivators,fluorescers, fabric hueing agents, fabric conditioners, preformedperacids, polymeric dispersing agents, clay soilremoval/anti-redeposition agents, filler salts, hydrotropes,brighteners, suds suppressors, structure elasticizing agents, fabricsofteners, hydro-lyzable surfactants, preservatives, anti-oxidants,anti-shrinkage agents, germicides, fungicides, anti-tarnish,anti-corrosion agents, alkalinity sources, solubilizing agents,carriers, processing aids, pigments, dyes, perfumes and pH controlagents. For example, these may include: bleach ingredients such as iminebleach boosters; sources of hydrogen peroxide such as percarbonateand/or perborate, especially percarbonate coated with material such ascarbonate and/or sulphate salt, silicate salt, borosilicate, and anymixture thereof; pre-formed peracid, including pre-formed peracid inencapsulated form; transition metal catalysts; suds suppressors orsuppressor systems such as silicone based suds suppressors and/or fattyacid based suds suppressors; fabric-softeners such as clay, siliconeand/or quaternary ammonium compounds; flocculants such as polyethyleneoxide; dye transfer inhibitors such as polyvinylpyrrolidone, poly4-vinylpyridine N-oxide and/or co-polymer of vinylpyrrolidone andvinylimidazole; fabric integrity components such as oligomers producedby the condensation of imidazole and epichlorhydrin; soil dispersantsand soil anti-redeposition aids such as alkoxylated polyamines andethoxylated ethyleneimine polymers; anti-redeposition components such aspolyesters; carboxylate polymers such as maleic acid polymers orco-polymers of maleic and acrylic acid; perfumes such as perfumemicrocapsules, starch encapsulated accords, perfume spray-on; soaprings; aesthetic particles; dyes; fillers such as sodium sulphate,although it is preferred for the composition to be substantially free offillers; silicate salt such as sodium silicate, including 1.6R and 2.0Rsodium silicate, or sodium metasilicate; co-polyesters of di-carboxylicacids and diols; cellulosic polymers such as methyl cellulose,carboxymethyl cellulose, hydroxyethoxycellulose, or other alkyl oralkylalkoxy cellulose; solvents such as 1,2 propanediol,monoethanolamine; diethylene glycol, ethanol, and any mixture thereof;hydrotropes such as sodium cumene sulphonate, sodium xylene sulphonate,sodium toluene sulphonate, and any mixtures; organic acids such ascitric acid; and any combination thereof.

Accordingly, the composition may further contain builders, such asbuilders based on carbonate, bicarbonate or silicates which may beZeolittes, such as Zeolit A, Zeolit MAP (Miximum Aluminium type P).Zeolites, useable in laundry preferably has the formulaNa₁₂(AlO₂)₁₂(SiO₂)₁₂.27H₂O and the particle size is usually between 1-10μm for zeolit A and 0.7-2 um for zeolit MAP. Other builders are Sodiummetasilicate (Na₂SiO₃.nH₂O or Na₂Si₂O₅.n H₂O) strong alkaline andpreferably used in dish wash. In preferred embodiments, the amount of adetergent builder may be above 5%, above 10%, above 20%, above 30%,above 40% or above 50%, and may be below 80%, 65%. In a dishwashdetergent, the level of builder is typically 40-65%, particularly 50-65%or even 75-90%.

In another preferred aspect the composition comprises one or moresurfactants, which may be non-ionic including semi-polar and/or anionicand/or cationic and/or zwitterionic and/or ampholytic and/or semi-polarnonionic and/or mixtures thereof. The surfactants are typically presentat a level of from 0.1% to 60% by weight, while in alternativeembodiments, the level is from about 1 percent to about 50 percent,while in still further embodiments, the level is from about 5 percent toabout 40 percent, by weight of the detergent composition.

When included therein the detergent will usually contain from about 1%to about 40% of an anionic surfactant such as linearalkylbenzenesulfonate, alpha-olefinsulfonate, alkyl sulfate (fattyalcohol sulfate), alcohol ethoxysulfate, secondary alkanesulfonate,alpha-sulfo fatty acid methyl ester, alkyl- or alkenylsuccinic acid orsoap.

When included therein the detergent will usually contain from about 0.2%to about 40% of a non-ionic surfactant such as alcohol ethoxylate,nonyl-phenol ethoxylate, alkylpolygly-coside, alkyldimethylamine-oxide,ethoxylated fatty acid monoethanol-amide, fatty acid monoeth-anolamide,polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives ofglucosamine (“glu-cam ides”).

Further suitable anionic surfactants are soaps and those containingsulfate or sulfonate groups. Surfactants of the sulfonate type that comeinto consideration are (C9-C13-alkyl)benzenesulfonates andolefinsulfonates, the latter being understood to be mixtures ofalkenesulfonates and hydroxyalkanesulfonates and -disulfonates, asobtained, for example, by sulfonation of C12-C18 monoolefins having aterminally or internally located double bond. Also suitable are(C12-C18)alkanesulfonates and esters of alpha-sulfo fatty acids (estersulfonates), for example the alpha-sulfonated methyl esters ofhydrogenated coconut, palm kernel or tallow fatty acids, typicallyproduced by saponification of triglycerides from the plant or animaloils followed by methylation and sulfonation, may be used.

Further suitable anionic surfactants are sulfonated fatty acid glycerolesters comprising mono-, di- and tri-esters and mixtures thereof.

Alk(en)yl sulfates to which preference is given are the alkali metalsalts and the sodium salts of sulfuric acid monoesters of C12-C18 fattyalcohols, for example from coconut fatty alcohol, tallow fatty alcohol,lauryl, myristyl, cetyl or stearyl alcohol, or of C10-C20 oxo alcoholsand sulfuric acid monoesters of secondary alcohols having that chainlength. From the point of view of washing technology, special preferenceis given to C12-C16 alkyl sulfates and C12-C15 alkyl sulfates and alsoto C14-C15 alkyl sulfates. Suitable anionic surfactants are alsoalkane-2,3-diylbis(sulfates) that are prepared, for example, inaccordance with U.S. Pat. No. 3,234,258 or 5,075,041.

Also suitable are the sulfuric acid monoesters of straight-chain orbranched C7-C21 alcohols ethoxylated with from 1 to 6 mole of ethyleneoxide, such as 2-methyl-branched C9-C11 alcohols with, on average, 3.5mole of ethylene oxide (EO) or C12-C18 fatty alcohols with from 1 to 4EO. Because of their high foaming characteristics, they are normallyused in washing and cleaning compositions only at relatively low levels,for example at levels of from 1% to 5% by weight.

Anionic surfactants may also include diesters, and/or salts ofmonoesters, of sulfosuccinic acid with C8-C18 fatty alcohol residues ormixtures thereof. Special preference is given to sulfosuccinates inwhich the fatty alcohol residues have a narrow chain lengthdistribution. It is likewise also possible to use alk(en)ylsulfosuccinates having preferably from 8 to 18 C-atoms in the alk(en)ylchain, or salts thereof.

Further anionic surfactants that come into consideration are fatty acidderivatives of amino acids, for example of methyltaurine (taurides)and/or of methylglycine (sarcosides). Further anionic surfactants thatcome into consideration are soaps. Saturated fatty acid soaps such asthe salts of lauric acid, myristic acid, palmitic acid, stearic acid,hydrogenated erucic acid and behenic acid and soap mixtures derived fromnatural fatty acids, for example coconut, palm kernel or tallow fattyacids. The anionic surfactants, including the soaps, may be present inthe form of their sodium, potassium or ammonium salts and in the form ofsoluble salts of organic bases such as mono-, di- or triethanolamine.The anionic surfactants may be present in the form of their sodium orpotassium salts. As non-ionic surfactants, preferably alkoxylated,advantageously ethoxylated and/or propoxylated, especially primaryalcohols having from 8 to 18 C-atoms and, on average, from 1 to 12 molesof ethylene oxide (EO) and/or from 1 to 10 moles of propylene oxide (PO)per mole of alcohol are used. Special preference is given to C8-C16alcohol alkoxylates, advantageously ethoxylated and/or propoxylatedC10-C15 alcohol alkoxylates, especially C12-C14 alcohol alkoxylates,having a degree of ethoxylation between 2 and 10, or between 3 and 8,and/or a degree of propoxylation between 1 and 6, or between 1.5 and 5.The alcohol residue may be preferably linear or, especially in the2-position, methyl-branched, or may comprise a mixture of linear andmethyl-branched chains, as are usually present in oxo alcohols. Specialpreference is given, however, to alcohol ethoxylates derived from linearalcohols of natural origin that contain from 12 to 18 C-atoms, forexample coconut, palm and tallow fatty alcohol or oleyl alcohol, and onaverage from 2 to 8 EO per mole of alcohol. The ethoxylated alcoholsinclude, for example, C12-C14 alcohols with 3 EO or 4 EO, C9-C11alcohols with 7 EO, C13-C15 alcohols with 3 EO, 5 EO, 7 EO or 8 EO,C12-18 alcohols with 3 EO, 5 EO or 7 EO, mixtures thereof, such asmixtures of C12-C14 alcohol with 3 EO and C12-C18 alcohol with 5 EO. Thementioned degrees of ethoxylation and propoxylation representstatistical averages which, for a specific product, can be a wholenumber or a fractional number. Preferred alcohol ethoxylates andpropoxylates have a restricted homologue distribution (narrow rangeethoxylates/propoxylates, NRE/NRP). In addition to those non-ionicsurfactants, fatty alcohol ethoxylates having more than 12 EO may alsobe used. Examples thereof are tallow fatty alcohol ethoxylate with 14EO, 25 EO, 30 EO or 40 EO.

Also suitable are alkoxylated amines, which are ethoxylated and/orpropoxylated, especially primary and secondary amines having from 1 to18 C-atoms per alkyl chain and, on average, from 1 to 12 moles ofethylene oxide (EO) and/or from 1 to 10 moles of propylene oxide (PO)per mole of amine.

In addition, as further non-ionic surfactants, there may also be usedalkyl polyglycosides of the general formula R₁O(G)_(x), wherein R₁ is aprimary straight-chain or methyl-branched (especially methyl-branched inthe 2-position) alkyl group having from 8 to 22, preferably from 12 to18, C-atoms and the symbol ‘G’ indicates a glycose (monosaccharide) unithaving 5 or 6 C-atoms; preferably G is glucose. The degree ofoligomerisation x, which indicates the average number of glycose units,will generally lie between 1 and 10; x is preferably from 1.2 to 1.4.

A further class of used non-ionic surfactants, which are used either assole non-ionic surfactant or in combination with other non-ionicsurfactants, comprises alkoxylated, preferably ethoxylated orethoxylated and propoxylated fatty acid alkyl esters, having from 1 to 4C-atoms in the alkyl chain, especially fatty acid methyl esters, asdescribed, for example, in JP58/217598.

Non-ionic surfactants of the amine oxide type, for example N-(cocoalkyl)-N,N-dimethylamine oxide andN-(tallow-alkyl)-N,N-bis(2-hydroxyethyl)amine oxide, and of the fattyacid alkanolamide or ethoxylated fatty acid alkanolamide type may alsobe suitable.

In a more preferred embodiment, the surfactant is sodium dodecylsulfate, quaternary ammonium compounds, alkyl pyridinium iodides, TWEEN™80 (polysorbate 80), TWEEN™ 85 (polyoxyethylene sorbitan trioleate),TRITON™ X-100 (2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethanol), Brij56, biological surfactants, rhamnolipid, surfactin, visconsin, orsulfonates.

In some embodiments the invention relates to a composition wherein theconcentration of the at least one surfactant is from 0 to 500, from0.00001 to 100, from 0.0001 to 50, from 0.0001 to 40, from 0.001 to 30,from 0.01 to 20, from 0.1 to 15, from 1 to 10 milligram per gram textilein the wash.

In some embodiments the invention relates to a composition, wherein theconcentration of the at least one surfactant is from 0 to 50, from0.0001 to 40, from 0.001 to 30, from 0.01 to 20 from 0.1 to 10, or from1 to 5 g per L solution.

The detergent composition of the invention may for example be formulatedas a hand or machine laundry detergent composition including a laundryadditive composition suitable for pre-treatment of stained fabrics and arinse added fabric softener composition, or be formulated as a detergentcomposition for use in general household hard surface cleaningoperations, or be for-mutated for hand or machine dishwashingoperations. The detergent may be a powder, or granulated form, or it maybe in the form of a liquid, gel or paste or in the form of a unit doseproduct such as a tablet or pouch, including multi-compartment pouches,or the detergent can be in the form of a sheet.

The detergent composition may comprise one or more other enzymes such asa protease, a lipase, a peroxidase, another amylolytic enzyme, e.g.,another alpha-amylase, glucoamylase, maltogenic amylase, CGTase and/or acellulase, mannanase (such as MANNAWAY™ from Novozymes, Denmark),pectinase, pectine lyase, cutinase, and/or laccase.

In general the properties of the chosen enzyme(s) should be compatiblewith the selected detergent, (i.e., pH-optimum, compatibility with otherenzymatic and non-enzymatic ingredients, etc.), and the enzyme(s) shouldbe present in effective amounts.

Proteases: Suitable proteases include metalloproteases and/or serineproteases, including neutral or alkaline microbial serine proteases,such as subtilisins (EC 3.4.21.62). Suitable proteases include those ofanimal, vegetable or microbial origin. In one aspect, such suitableprotease may be of microbial origin. The suitable proteases includechemically or genetically modified mutants of the aforementionedsuitable proteases. In one aspect, the suitable protease may be a serineprotease, such as an alkaline microbial protease or/and a trypsin-typeprotease. Examples of suitable neutral or alkaline proteases include:

(a) subtilisins (EC 3.4.21.62), including those derived from Bacillus,such as Bacillus lentus, B. alkalophilus, B. subtilis, B.amyloliquefaciens, Bacillus pumilus and Bacillus gibsonii described inU.S. Pat. No. 6,312,936 B1, U.S. Pat. Nos. 5,679,630, 4,760,025,7,262,042 and WO09/021867.(b) trypsin-type or chymotrypsin-type proteases, such as trypsin (e.g.,of porcine or bovine origin), including the Fusarium protease describedin WO 89/06270 and the chymotrypsin proteases derived from Cellumonasdescribed in WO 05/052161 and WO 05/052146.(c) metalloproteases, including those derived from Bacillusamyloliquefaciens described in WO 07/044993A2.

Preferred proteases include those derived from Bacillus gibsonii orBacillus Lentus.

Suitable commercially available protease enzymes include those soldunder the trade names ALCALASE®, SAVINASE®, PRIMASE®, DURAZYM®,POLARZYME®, KANNASE®, LIQUANASE®, LIQUANASE ULTRA®, SAVINASE ULTRA®,OVOZYME®, NEUTRASE®, EVER-LASE® and ESPERASE® by Novozymes A/S(Denmark), those sold under the tradename MAX-ATASE®, MAXACAL®,MAXAPEM®, PROPERASE®, PURAFECT®, PURAFECT PRIME®, PURAFECT OX®, FN3®,FN4®, EXCELLASE® and PURAFECT OXP® by Genencor International, those soldunder the tradename OPTICLEAN® and OPTIMASE® by Solvay Enzymes, thoseavailable from Henkel/Kemira, namely BLAP (sequence shown in FIG. 29 ofU.S. Pat. No. 5,352,604 with the following mutations S99D+S101R+S103A+V1041+G159S, hereinafter referred to as BLAP), BLAP R (BLAP withS3T+V41+V199M+V205I+L217D), BLAP X (BLAP with S3T+V41+V205I) and BLAPF49 (BLAP with S3T+V41+A194P+V199M+V205I+L217D)—all from Henkel/Kemira;and KAP (Bacillus alkalophilus subtilisin with mutationsA230V+S256G+S259N) from Kao.

Lipases: Suitable lipases include those of bacterial or fungal origin.Chemically modified or protein engineered mutants are included. Examplesof useful lipases include lipases from Humicola (synonym Thermomyces),e.g., from H. lanuginosa (T. lanuginosus) as described in EP 258 068 andEP 305 216 or from H. insolens as described in WO 96/13580, aPseudomonas lipase, e.g., from P. alcaligenes or P. pseudoalcaligenes(EP 218 272), P. cepacia (EP 331 376), P. stutzeri (GB 1,372,034), P.fluorescens, Pseudomonas sp. strain SD 705 (WO 95/06720 and WO96/27002), P. wisconsinensis (WO 96/12012), a Bacillus lipase, e.g.,from B. subtilis (Dartois et al. (1993), Biochemica et Biophysica Acta,1131, 253-360), B. stearothermophilus (JP 64/744992) or B. pumilus (WO91/16422).

The lipase may be a “first cycle lipase” such as those described in U.S.Pat. No. 6,939,702 B1 and US PA 2009/0217464. In one aspect, the lipaseis a first-wash lipase, preferably a variant of the wild-type lipasefrom Thermomyces lanuginosus comprising T231R and N233R mutations. Thewild-type sequence is the 269 amino acids (amino acids 23-291) of theSwissprot accession number Swiss-Prot 059952 (derived from Thermomyceslanuginosus (Humicola lanuginosa)). Preferred lipases would includethose sold under the tradenames Lipex®, Lipolex® andLipo-clean®.Cellulases: Suitable cellulases include those of bacterialor fungal origin. Chemically modified or protein engineered mutants areincluded. Suitable cellulases include cellulases from the generaBacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, e.g.,the fungal cellulases produced from Humicola insolens, Myceliophthorathermophila and Fusarium oxysporum disclosed in U.S. Pat. Nos.4,435,307, 5,648,263, 5,691,178, 5,776,757 and WO 89/09259.

Cellulases: Suitable cellulases include those of bacterial or fungalorigin. Chemically modified or protein engineered mutants are included.Suitable cellulases include cellulases from the genera Bacillus,Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, e.g., the fungalcellulases produced from Humicola insolens, Myceliophthora thermophilaand Fusarium oxysporum disclosed in U.S. Pat. Nos. 4,435,307, 5,648,263,5,691,178, 5,776,757 and WO 89/09259.

Especially suitable cellulases are the alkaline or neutral cellulaseshaving colour care ben-efits. Examples of such cellulases are cellulasesdescribed in EP 0 495 257, EP 0 531 372, WO 96/11262, WO 96/29397, WO98/08940. Other examples are cellulase variants such as those describedin WO 94/07998, EP 0 531 315, U.S. Pat. Nos. 5,457,046, 5,686,593,5,763,254, WO 95/24471, WO 98/12307 and PCT/DK98/00299.

Commercially available cellulases include CELLUZYME®, and CAREZYME®(Novozymes A/S), CLAZINASE®, and PURADAX HA® (Genencor InternationalInc.), and KAC-500(B)® (Kao Corporation).

Peroxidases/Oxidases: Suitable peroxidases/oxidases include those ofplant, bac-terial or fungal origin. Chemically modified or proteinengineered mutants are included. Examples of useful peroxidases includeperoxidases from Coprinus, e.g., from C. cinereus, and variants thereofas those described in WO 93/24618, WO 95/10602, and WO 98/15257.

Commercially available peroxidases include GUARDZYME® (Novozymes A/S).

Other enzymes: Other preferred enzymes include pectate lyases sold underthe tradenames PECTAWASH®, PECTAWAY® and mannanases sold under thetradenames MANNAWAY® (all from Novozymes A/S, Bagsvaerd, Denmark), andPURABRITE® (Genencor International Inc., Palo Alto, Calif.).

The detergent enzyme(s) may be included in a detergent composition byadding separate additives containing one or more enzymes, or by adding acombined additive comprising all of these enzymes. A detergent additiveof the invention, i.e., a separate additive or a combined additive, canbe formulated, e.g., granulate, a liquid, a slurry, etc. Preferreddetergent additive formulations are granulates, in particularnon-dusting granulates, liquids, in particular stabilized liquids, orslurries.

Non-dusting granulates may be produced, e.g., as disclosed in U.S. Pat.Nos. 4,106,991 and 4,661,452 and may optionally be coated by methodsknown in the art. Examples of waxy coating materials are poly(ethyleneoxide) products (polyethyleneglycol, PEG) with mean molar weights of1000 to 20000; ethoxylated nonyl-phenols having from 16 to 50 ethyleneoxide units; ethoxylated fatty alcohols in which the alcohol containsfrom 12 to 20 carbon atoms and in which there are 15 to 80 ethyleneoxide units; fatty alcohols; fatty acids; and mono- and di- andtriglycerides of fatty acids. Examples of film-forming coating materialssuitable for application by fluid bed techniques are given in GB1483591. Liquid enzyme preparations may, for instance, be stabilized byadding a polyol such as propylene glycol, a sugar or sugar alcohol,lactic acid or boric acid according to established methods. Protectedenzymes may be prepared according to the method disclosed in EP 238,216.

The detergent composition of the invention may be in any convenientform, e.g., a bar, a tablet, a powder, a granule, a paste, a gel, aliquid, a powder—form all-purpose, a “heavy-duty” washing agent, apaste-form all-purpose, a heavy-duty liquid type, a liquid fine-fabric,a hand dishwashing agent, a light duty dishwashing agent, a high-foamingtype. a machine dishwashing agent, a various tablet, a dishwashgranular, a dish wash liquid, a rinse-aid type. The composition can alsobe in unit dose packages, including those known in the art and thosethat are water soluble, water insoluble and/or water permeable. A liquiddetergent may be aqueous, typically containing up to 70% water and 0-30%organic solvent, or non-aqueous or a solution containing more than 0.5g/L of the detergent composition. The composition of the invention mayfor example be formulated as a hand or machine laundry detergentcomposition including a laundry additive composition suitable forpre-treatment of stained fabrics and a rinse added fabric softenercomposition, or be formulated as a detergent composition for use ingeneral household hard surface cleaning operations, or be formulated forhand or machine dishwashing operations. The detergent may be a powder,or granulated form, or it may be in the form of a liquid, gel or pasteor in the form of a unit dose product such as a tablet or pouch,including multi-compartment pouches, or the detergent can be in the formof a sheet.

The composition may comprise a fabric hueing agent. Suitable fabrichueing agents include dyes, dye-clay conjugates, and pigments thatpreferably satisfy the requirements of Test Method 1, described hereinbelow. Suitable dyes include small molecule dyes and polymeric dyes.Suitable small molecule dyes include small molecule dyes selected fromthe group consisting of dyes falling into the Colour Index (C.I.)classifications of Direct Blue, Direct Red, Direct Violet, Acid Blue,Acid Red, Acid Violet, Basic Blue, Basic Violet and Basic Red, ormixtures thereof, for example:

(1) Tris-Azo Direct Blue Dyes of the Formula

where at least two of the A, B and C napthyl rings are substituted by asulfonate group, the C ring may be substituted at the 5 position by anNH₂ or NHPh group, X is a benzyl or naphthyl ring substituted with up to2 sulfonate groups and may be substituted at the 2 position with an OHgroup and may also be substituted with an NH₂ or NHPh group.(2) Bis-Azo Direct Violet Dyes of the Formula:

where Z is H or phenyl, the A ring is preferably substituted by a methyland methoxy group at the positions indicated by arrows, the A ring mayalso be a naphthyl ring, the Y group is a benzyl or naphthyl ring, whichis substituted by sulfate group and may be mono or disubstituted bymethyl groups.(3) Blue or Red Acid Dyes of the Formula

where at least one of X and Y must be an aromatic group. In one aspect,both the aromatic groups may be a substituted benzyl or naphthyl group,which may be substituted with non water-solubilising groups such asalkyl or alkyloxy or aryloxy groups, X and Y may not be substituted withwater solubilising groups such as sulfonates or carboxylates. In anotheraspect, X is a nitro substituted benzyl group and Y is a benzyl group(4) Red Acid Dyes of the Structure

where B is a naphthyl or benzyl group that may be substituted with nonwater solubilising groups such as alkyl or alkyloxy or aryloxy groups, Bmay not be substituted with water solubilising groups such as sulfonatesor carboxylates.(5) Dis-Azo Dyes of the Structure

wherein X and Y, independently of one another, are each hydrogen, C₁-C₄alkyl or C₁-C₄-alkoxy, R□ is hydrogen or aryl, Z is C₁-C₄ alkyl;C₁-C₄-alkoxy; halogen; hydroxyl or carboxyl, n is 1 or 2 and m is 0, 1or 2, as well as corresponding salts thereof and mixtures thereof(6) Triphenylmethane Dyes of the Following Structures

and mixtures thereof. In another aspect, suitable small molecule dyesinclude small molecule dyes selected from the group consisting of ColourIndex (Society of Dyers and Colourists, Bradford, UK) numbers DirectViolet 9, Direct Violet 35, Direct Violet 48, Direct Violet 51, DirectViolet 66, Direct Blue 1, Direct Blue 71, Direct Blue 80, Direct Blue279, Acid Red 17, Acid Red 73, Acid Red 88, Acid Red 150, Acid Violet15, Acid Violet 17, Acid Violet 24, Acid Violet 43, Acid Red 52, AcidViolet 49, Acid Blue 15, Acid Blue 17, Acid Blue 25, Acid Blue 29, AcidBlue 40, Acid Blue 45, Acid Blue 75, Acid Blue 80, Acid Blue 83, AcidBlue 90 and Acid Blue 113, Acid Black 1, Basic Violet 1, Basic Violet 3,Basic Violet 4, Basic Violet 10, Basic Violet 35, Basic Blue 3, BasicBlue 16, Basic Blue 22, Basic Blue 47, Basic Blue 66, Basic Blue 75,Basic Blue 159 and mixtures thereof. In another aspect, suitable smallmolecule dyes include small molecule dyes selected from the groupconsisting of Colour Index (Society of Dyers and Colourists, Bradford,UK) numbers Acid Violet 17, Acid Violet 43, Acid Red 52, Acid Red 73,Acid Red 88, Acid Red 150, Acid Blue 25, Acid Blue 29, Acid Blue 45,Acid Blue 113, Acid Black 1, Direct Blue 1, Direct Blue 71, DirectViolet 51 and mixtures thereof. In another aspect, suitable smallmolecule dyes include small molecule dyes selected from the groupconsisting of Colour Index (Society of Dyers and Colourists, Bradford,UK) numbers Acid Violet 17, Direct Blue 71, Direct Violet 51, DirectBlue 1, Acid Red 88, Acid Red 150, Acid Blue 29, Acid Blue 113 ormixtures thereof.

Suitable polymeric dyes include polymeric dyes selected from the groupconsisting of polymers containing conjugated chromogens (dye-polymerconjugates) and polymers with chromogens co-polymerized into thebackbone of the polymer and mixtures thereof.

In another aspect, suitable polymeric dyes include polymeric dyesselected from the group consisting of fabric-substantive colorants soldunder the name of LIQUITINT® (Milliken, Spartanburg, S.C., USA),dye-polymer conjugates formed from at least one reactive dye and apolymer selected from the group consisting of polymers comprising amoiety selected from the group consisting of a hydroxyl moiety, aprimary amine moiety, a secondary amine moiety, a thiol moiety andmixtures thereof. In still another aspect, suitable polymeric dyesinclude polymeric dyes selected from the group consisting of LIQUITINT®(Milliken, Spartanburg, S.C., USA) Violet CT, carboxymethyl cellulose(CMC) conjugated with a reactive blue, reactive violet or reactive reddye such as CMC conjugated with C.I. Reactive Blue 19, sold by Megazyme,Wicklow, Ireland under the product name AZO-CM-CELLULOSE, product codeS-ACMC, alkoxylated triphenyl-methane polymeric colourants, alkoxylatedthiophene polymeric colourants, and mixtures thereof.

Suitable dye clay conjugates include dye clay conjugates selected fromthe group comprising at least one cationic/basic dye and a smectiteclay, and mixtures thereof. In another aspect, suitable dye clayconjugates include dye clay conjugates selected from the groupconsisting of one cationic/basic dye selected from the group consistingof C.I. Basic Yellow 1 through 108, C.I. Basic Orange 1 through 69, C.I.Basic Red 1 through 118, C.I. Basic Violet 1 through 51, C.I. Basic Blue1 through 164, C.I. Basic Green 1 through 14, C.I. Basic Brown 1 through23, CI Basic Black 1 through 11, and a clay selected from the groupconsisting of Montmorillonite clay, Hectorite clay, Saponite clay andmixtures thereof. In still another aspect, suitable dye clay conjugatesinclude dye clay conjugates selected from the group consisting of:Montmorillonite Basic Blue B7 C.I. 42595 conjugate, MontmorilloniteBasic Blue B9 C.I. 52015 conjugate, Montmorillonite Basic Violet V3 C.I.42555 conjugate, Montmorillonite Basic Green G1 C.I. 42040 conjugate,Montmorillonite Basic Red R1 C.I. 45160 conjugate, Montmorillonite C.I.Basic Black 2 conjugate, Hectorite Basic Blue B7 C.I. 42595 conjugate,Hectorite Basic Blue B9 C.I. 52015 conjugate, Hectorite Basic Violet V3C.I. 42555 conjugate, Hectorite Basic Green G1 C.I. 42040 conjugate,Hectorite Basic Red R1 C.I. 45160 conjugate, Hectorite C.I. Basic Black2 conjugate, Saponite Basic Blue B7 C.I. 42595 conjugate, Saponite BasicBlue B9 C.I. 52015 conjugate, Saponite Basic Violet V3 C.I. 42555conjugate, Saponite Basic Green G1 C.I. 42040 conjugate, Saponite BasicRed R1 C.I. 45160 conjugate, Saponite C.I. Basic Black 2 conjugate andmixtures thereof.

Suitable pigments include pigments selected from the group consisting offlavanthrone, indanthrone, chlorinated indanthrone containing from 1 to4 chlorine atoms, pyranthrone, dichlo-ropyranthrone,monobromodichloropyranthrone, dibromodichloropyranthrone,tetrabromopy-ranthrone, perylene-3,4,9,10-tetracarboxylic acid diimide,wherein the imide groups may be un-substituted or substituted byC1-C3-alkyl or a phenyl or heterocyclic radical, and wherein the phenyland heterocyclic radicals may additionally carry substituents which donot confer solubility in water, anthrapyrimidinecarboxylic acid amides,violanthrone, isoviolanthrone, dioxazine pigments, copper phthalocyaninewhich may contain up to 2 chlorine atoms per molecule, polychloro-copperphthalocyanine or polybromochloro-copper phthalocyanine containing up to14 bromine atoms per molecule and mixtures thereof.

In another aspect, suitable pigments include pigments selected from thegroup consisting of Ultramarine Blue (C.I. Pigment Blue 29), UltramarineViolet (C.I. Pigment Violet 15) and mixtures thereof.

The aforementioned fabric hueing agents can be used in combination (anymixture of fabric hueing agents can be used). Suitable fabric hueingagents can be purchased from Aldrich, Milwaukee, Wis., USA; CibaSpecialty Chemicals, Basel, Switzerland; BASF, Ludwigshafen, Germany;Dayglo Color Corporation, Mumbai, India; Organic Dyestuffs Corp., EastProvi-dence, Rhode Island, USA; Dystar, Frankfurt, Germany; Lanxess,Leverkusen, Germany; Megazyme, Wicklow, Ireland; Clariant, Muttenz,Switzerland; Avecia, Manchester, UK and/or made in accordance with theexamples contained herein. Suitable hueing agents are described in moredetail in U.S. Pat. No. 7,208,459 B2.

Test Method 1

A protocol to define whether a dye or pigment material is a fabrichueing agent for the purpose of the invention is given here:

-   1.) Fill two tergotometer pots with 800 ml of Newcastle upon Tyne,    UK, City Water (˜12 grains per US gallon total hardness, supplied by    Northumbrian Water, Pity Me, Durham, Co. Durham, UK).-   2) Insert pots into tergotometer, with water temperature controlled    at 30° C. and agitation set at 40 rpm for the duration of the    experiment.-   3) Add 4.8 g of IEC-B detergent (IEC 60456 Washing Machine Reference    Base Detergent Type B), supplied by wfk, BrOggen-Bracht, Germany, to    each pot.-   4) After two minutes, add 2.0 mg active colorant to the first pot.-   5) After one minute, add 50 g of flat cotton vest (supplied by    Warwick Equest, Consett, County Durham, UK), cut into 5 cm×5 cm    swatches, to each pot.-   6) After 10 minutes, drain the pots and re-fill with cold Water (16°    C.) having a water hardness of 14.4 English Clark Degrees Hardness    with a 3:1 Calcium to Magnesium molar ratio.-   7) After 2 minutes rinsing, remove fabrics.-   8) Repeat steps 3-7 for a further three cycles using the same    treatments.-   9) Collect and line dry the fabrics indoors for 12 hours.-   10) Analyse the swatches using a Hunter Miniscan spectrometer fitted    with D65 illuminant and UVA cutting filter, to obtain Hunter a    (red-green axis) and Hunter b (yellow-blue axis) values.-   11) Average the Hunter a and Hunter b values for each set of    fabrics. If the fabrics treated with colorant under assessment show    an average difference in hue of greater than 0.2 units on either the    a axis or b axis, it is deemed to be a fabric hueing agent for the    purpose of the invention.

The composition may comprise an encapsulate. In one aspect, anencapsulate comprising a core, a shell having an inner and outersurface, said shell encapsulating said core.

In one aspect of said encapsulate, said core may comprise a materialselected from the group consisting of perfumes; brighteners; dyes;insect repellants; silicones; waxes; flavors; vita-mins; fabricsoftening agents; skin care agents in one aspect, paraffins; enzymes;anti-bacterial agents; bleaches; sensates; and mixtures thereof; andsaid shell may comprise a material selected from the group consisting ofpolyethylenes; polyamides; polystyrenes; polyisoprenes; pol-ycarbonates;polyesters; polyacrylates; aminoplasts, in one aspect said aminoplastmay comprise a polyureas, polyurethane, and/or polyureaurethane, in oneaspect said polyurea may comprise polyoxymethyleneurea and/or melamineformaldehyde; polyolefins; polysaccharides, in one aspect saidpolysaccharide may comprise alginate and/or chitosan; gelatin; shellac;epoxy resins; vinyl polymers; water insoluble inorganics; silicone; andmixtures thereof.

In one aspect of said encapsulate, said core may comprise perfume.

In one aspect of said encapsulate, said shell may comprise melamineformaldehyde and/or cross linked melamine formaldehyde.

In a one aspect, suitable encapsulates may comprise a core material anda shell, said shell at least partially surrounding said core material,is disclosed. At least 75%, 85% or even 90% of said encapsulates mayhave a fracture strength of from about 0.2 MPa to about 10 MPa, fromabout 0.4 MPa to about 5 MPa, from about 0.6 MPa to about 3.5 MPa, oreven from about 0.7 MPa to about 3M Pa; and a benefit agent leakage offrom 0% to about 30%, from 0% to about 20%, or even from 0% to about 5%.

In one aspect, at least 75%, 85% or even 90% of said encapsulates mayhave a particle size of from about 1 microns to about 80 microns, about5 microns to 60 microns, from about 10 microns to about 50 microns, oreven from about 15 microns to about 40 microns.

In one aspect, at least 75%, 85% or even 90% of said encapsulates mayhave a particle wall thickness of from about 30 nm to about 250 nm, fromabout 80 nm to about 180 nm, or even from about 100 nm to about 160 nm.

In one aspect, said encapsulates' core material may comprise a materialselected from the group consisting of a perfume raw material and/oroptionally a material selected from the group consisting of vegetableoil, including neat and/or blended vegetable oils including caster oil,coconut oil, cottonseed oil, grape oil, rapeseed, soybean oil, corn oil,palm oil, linseed oil, safflower oil, olive oil, peanut oil, coconutoil, palm kernel oil, castor oil, lemon oil and mixtures thereof; estersof vegetable oils, esters, including dibutyl adipate, dibutyl phthalate,butyl benzyl adipate, benzyl octyl adipate, tricresyl phosphate,trioctyl phosphate and mixtures thereof; straight or branched chainhydrocarbons, including those straight or branched chain hydrocarbonshaving a boiling point of greater than about 80° C.; partiallyhydrogenated terphenyls, dialkyl phthalates, alkyl biphenyls, includingmonoisopropylbiphenyl, alkylated naphthalene, includingdipropylnaph-thalene, petroleum spirits, including kerosene, mineral oiland mixtures thereof; aromatic solvents, including benzene, toluene andmixtures thereof; silicone oils; and mixtures thereof.

In one aspect, said encapsulates' wall material may comprise a suitableresin including the reaction product of an aldehyde and an amine,suitable aldehydes include, formaldehyde. Suitable amines includemelamine, urea, benzoguanamine, glycoluril, and mixtures thereof.Suitable melamines include methylol melamine, methylated methylolmelamine, imino melamine and mixtures thereof. Suitable ureas includedimethylol urea, methylated dimethylol urea, urea-res-orcinol, andmixtures thereof.

In one aspect, suitable formaldehyde scavengers may be employed with theencapsulates, for example, in a capsule slurry and/or added to aconsumer product before, during or after the encapsulates are added tosuch consumer product.

Suitable capsules that can be made by following the teaching of USPA2008/0305982 A1; and/or USPA 2009/0247449 A1. Alternatively, suitablecapsules can be purchased from Appleton Papers Inc. of Appleton, Wis.USA.

In addition, the materials for making the aforementioned encapsulatescan be obtained from Solutia Inc. (St Louis, Mo. U.S.A.), CytecIndustries (West Paterson, N.J. U.S.A.), sigma-Aldrich (St. Louis, Mo.U.S.A.), CP Kelco Corp. of San Diego, Calif., USA; BASF AG ofLudwigshafen, Germany; Rhodia Corp. of Cranbury, N.J., USA; HerculesCorp. of Wilmington, Del., USA; Agrium Inc. of Calgary, Alberta, Canada,ISP of New Jersey U.S.A., Akzo Nobel of Chicago, Ill., USA; StroeverShellac Bremen of Bremen, Germany; Dow Chemical Company of Midland,Mich., USA; Bayer AG of Leverkusen, Germany; Sigma-Aldrich Corp., St.Louis, Mo., USA

In one aspect, the composition may comprise an enzyme stabilizerselected from the group consisting of (a) inorganic salts selected fromthe group consisting of calcium salts, magnesium salts and mixturesthereof; (b) carbohydrates selected from the group consisting ofoligo-saccharides, polysaccharides and mixtures thereof; (c) massefficient reversible protease inhibitors selected from the groupconsisting of phenyl boronic acid and derivatives thereof; and (d)mixtures thereof.

In another embodiment, the composition comprises: (1) reversibleprotease inhibitors such as a boron containing compound; (2) 1-2 propanediol; (3) calcium formate and/or sodium formate; and (4) any combinationthereof.

In one aspect, the composition may comprise a structurant selected fromthe group consisting of diglycerides and triglycerides, ethylene glycoldistearate microcrystalline cellulose, cel-lulose-based materials,microfiber cellulose, biopolymers, xanthan gum, gellan gum, and mixturesthereof.

The detergent may comprise one or more polymers. Examples arecarboxymethylcellu-lose, poly(vinyl-pyrrolidone), poly (ethyleneglycol), poly(vinyl alcohol), poly(vinylpyridine-N-oxide),poly(vinylimidazole), polycarboxylates such as polyacrylates,maleic/acrylic acid copolymers and lauryl methacrylate/acrylic acidco-polymers.

The detergent may contain a bleaching system, which may comprise a H₂O₂source such as perborate or percarbonate which may be combined with aperacid-forming bleach activator such as tetraacetylethylenediamine ornonanoyloxyben-zenesul-fonate. Alternatively, the bleaching system maycomprise peroxyacids of, e.g., the amide, imide, or sulfone type. Ingeneral, when a bleaching agent is used, the compositions of the presentinvention may comprise from about 0.1% to about 50% or even from about0.1% to about 25% bleaching agent by weight of the subject cleaningcomposition. The enzyme variants of the invention may be stabilizedusing conventional stabilizing agents or and protease inhibitors, e.g.,a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol,different salts such as NaCl and KCl; lactic acid, formic acid, boricacid, or a boric acid derivative, e.g., an aromatic borate ester, or aphenyl boronic acid derivative such as 4-formylphenyl boronic acid, or apeptide aldehyde such as di-, tri- or tetrapeptide aldehydes or aldehydeanalogues (either of the form B1-B0-R wherein, R is H, CH3, CX3, CHX2,or CH2X (X=halogen), B0 is a single amino acid residue (preferably withan optionally substituted aliphatic or aromatic side chain); and B1consists of one or more amino acid residues (preferably one, two orthree), optionally comprising an N-terminal protection group, or asdescribed in WO09118375, WO98/13459) or a protease inhibitor of theprotein type such as RASI, BASI, WASI (bifunctionalalpha-amylase/subtilisin inhibitors of rice, barley and wheat) or 012 orSSI.

The composition may be formulated as described in, e.g., WO 92/19709 andWO 92/19708 or U.S. Pat. No. 6,472,364. In some embodiments, the enzymesemployed herein are stabilized by the presence of water-soluble sourcesof zinc (II), calcium (II) and/or magnesium (II) ions in the finishedcompositions that provide such ions to the enzymes, as well as othermetal ions (e.g., barium (II), scandium (II), iron (II), manganese (II),aluminum (III), Tin (II), cobalt (II), copper (II), Nickel (II), andoxovanadium (IV)).

The detergent may also contain other conventional detergent ingredientssuch as e.g. fabric conditioners including clays, foam boosters, sudssuppressors, anti-corrosion agents, soil-suspending agents, anti-soilre-deposition agents, dyes, bactericides, optical brighteners,hydrotropes, tarnish inhibitors, organic solvents such as ethanol, orperfumes. Furthermore, the detergent could contain a pre-spotter or abooster, which is added to the wash to increase the general cleaninglevel, some of these additives may also be used as a pre-treatment agentapplied to the textile before the washing step.

It is at present contemplated that in the detergent compositions anyenzyme, in particular the enzyme of the invention, may be added in anamount corresponding to 0.001-100 mg of enzyme protein per liter of washliquor, preferably 0.005-5 mg of enzyme protein per liter of washliquor, more preferably 0.01-1 mg of enzyme protein per liter of washliquor and in particular 0.1-1 mg of enzyme protein per liter of washliquor. However, the detergent compositions of the present inventioncomprise at least 0.0001 to about 0.1% weight percent of pure enzymeprotein, such as from about 0.0001% to about 0.01%, from about 0.001% toabout 0.01% or from about 0.001% to about 0.01%. However, when using aformulated enzyme the detergent composition comprises from about 0.02%to about 20% weight percent, such as or from about 0.05% to about 15%weight, or from about 0.05 to about 20%, or from about 0.05% to about5%, or from about 0.05% to about 3%.

The alpha-amylase variants of the invention may additionally beincorporated in the detergent formulations disclosed in WO 97/07202,which is hereby incorporated as reference.

The composition typically comprises other detergent ingredients.Suitable detergent ingredients include: bleach; imine bleach boosters;sources of hydrogen peroxide such as percarbonate and/or perborate,especially percarbonate coated with material such as carbonate and/orsulphate salt, silicate salt, borosilicate, and any mixture thereof;pre-formed peracid, including pre-formed peracid in encapsulated form;transition metal catalysts; suds suppressing systems such as siliconebased suds suppressors and/or fatty acid based suds suppressors;brighteners; photobleach; fabric-softening agents such as clay, siliconeand/or quaternary ammonium compounds; flocculants such as polyethyleneoxide; dye transfer inhibitors such as polyvinylpyrrolidone, poly4-vinylpyridine N-oxide and/or co-polymer of vinylpyrrolidone andvinylimidazole; fabric integrity components such as oligomers producedby the condensation of imidazole and epichlorhydrin; soil dispersantsand soil anti-redeposition aids such as alkoxylated polyamines andethoxylated ethyleneimine polymers; anti-redeposition components such aspolyesters; carboxylate polymers such as maleic acid polymers orco-polymers of maleic and acrylic acid; perfumes such as perfumemicrocapsules, starch encapsulated accords, perfume spray-on; soaprings; aesthetic particles; dyes; fillers such as sodium sulphate,although it is preferred for the composition to be substantially free offillers; silicate salt such as sodium silicate, including 1.6R and 2.0Rsodium silicate, or sodium metasilicate; co-polyesters of di-carboxylicacids and diols; cellulosic polymers such as methyl cellulose,carboxymethyl cellulose, hydroxyethoxycellulose, or other alkyl oralkylalkoxy cellulose; solvents such as 1,2 propanediol,monoethanolamine; diethylene glycol, ethanol, and any mixture thereof;hydrotropes such as sodium cumene sulphonate, sodium xylene sulphonate,sodium toluene sulphonate, and any mixtures; organic acids such ascitric acid; and any combination thereof.

Example Laundry Detergent Composition

The following are liquid laundry detergent compositions suitable fortop-loading automatic washing machines (1 and 2) and front loadingwashing machines (3).

Composition (wt % of composition) Ingredient 1 2 3 C₁₂₋₁₅Alkylethoxy(1.8)sulfate 14.7 11.6 C_(11.8) Alkylbenzene sulfonate 4.311.6 8.3 C₁₆₋₁₇ Branched alkyl sulfate 1.7 1.29 C₁₂₋₁₄ Alkyl-9-ethoxylate 0.9 1.07 C₁₂ dimethylamine oxide 0.6 0.64 Citric acid 3.50.65 3 C₁₂₋₁₈ fatty acid 1.5 2.32 3.6 Sodium Borate (Borax) 2.5 2.46 1.2Sodium C₁₂₋₁₄ alkyl ethoxy 3 sulfate 2.9 C₁₄₋₁₅ alkyl 7-ethoxylate 4.2C₁₂₋₁₄ Alkyl -7-ethoxylate 1.7 Calcium formate 0.09 0.09 A compoundhaving the following general structure: 1.2bis((C₂H₅O)(C₂H₄O)n)(CH₂)—N⁺—C_(x)H_(2x)—N⁺—(CH₃)- bis((C₂H₅O)(C₂H₄O)n),wherein n = from 20 to 30, and x = from 3 to 8, or sulphated orsulphonated variants thereof Random graft co-polymer¹ 1.46 0.5Ethoxylated Polyethylenimine ² 1.5 1.29 Diethylene triamine pentaaceticacid 0.34 0.64 Diethylene triamine penta(methylene phosphonic acid) 0.3Tinopal AMS-GX 0.06 Tinopal CBS-X 0.2 0.17 Amphiphilic alkoxylatedgrease cleaning polymer ³ 1.28 1 0.4 Ethanol 2 1.58 1.6 Propylene Glycol3.9 3.59 1.3 Diethylene glycol 1.05 1.54 Polyethylene glycol 0.06 0.04Monoethanolamine 3.05 2.41 0.4 NaOH 2.44 1.8 Sodium Cumene Sulphonate 1Sodium Formate 0.11 Water, Aesthetics (Dyes, perfumes) and MinorsBalance balance balance (Enzymes, solvents, structurants) ¹Random graftcopolymer is a polyvinyl acetate grafted polyethylene oxide copolymerhaving a polyethylene oxide backbone and multiple polyvinyl acetate sidechains. The molecular weight of the polyethylene oxide backbone is about6000 and the weight ratio of the polyethylene oxide to polyvinyl acetateis about 40 to 60 and no more than 1 grafting point per 50 ethyleneoxide units. ² Polyethylenimine (MW = 600) with 20 ethoxylate groups per—NH. ³ Amphiphilic alkoxylated grease cleaning polymer is apolyethylenimine (MW = 600) with 24 ethoxylate groups per —NH and 16propoxylate groups per —NHCompositions 4-8 Automatic Dishwashing Gels

4 5 6 7 8 (wt %) (wt %) (wt %) (wt %) (wt %) Wetting agent¹ 1.0 1.3 0.81 0.9 Sodium Benzoate (33% active) 0.61 0.61 0.61 0.6 0.6 Xanthan gum1.0 0.8 1.2 1 1.1 Sodium Sulphate 10.0 10.0 10.0 8 10 Perfume 0.03 0.050.03 0.06 0.1 Sodium Silicate 0 0 0 0 2 Citric Acid (50% active) 12.5 011 0 12 GLDA 0 7 0 8 0 Savinase Ultra XL(44 mg active/g)² 0.7 0 0.3 0 04-Formyl-Phenyl Boronic Acid 0 0 0.05 0 0 Encapsulated Protease (10mg/g) ³ 0.0 2.0 0.0 0 0 FN3 liquid (48 mg active/g) ⁴ 0.0 0.0 0 0.6 0Protease Prill (123 mg active/g) ⁴ 0 0 0 0 0.5 Ethanol 0.0 0.0 0 0.3 0Potassium Hydroxide (45% active) 14.6 14.6 14.6 14 0 Calcium Chloride(25% active) 1.8 1.8 1.8 1.1 0.4 Dye 0.05 0.05 0.05 0.05 0.02 ProxcelGXL ™ (19% active) ⁸ 0.05 0.05 0.05 0.05 0.05 Acusol ™ 820 ⁹ 0.34 0.340.3 0.35 0.3 Acusol ™ 425N (50% active) ⁹ 3.0 3.0 3.5 2.5 2 Amylases ofthis invention (25 mg/g 0.2 0.5 0.4 0.3 0.1 active)² Water & otheradjunct ingredients Balance Balance Balance Balance Balance to 100% to100% to 100% to 100% to 100% ¹Sold under tradename Polytergent ® SLF-18by BASF, Ludwigshafen, Germany. ²Sold by Novozymes A/S, Denmark. ³Encapsulated protease of this invention ⁴ Sold by GenencorInternational, California, USA. Suitable protease prills are sold underthe tradenames FN3 ® and Properase ®. ⁶ Sold by Alco Chemical,Tennessee, USA. ⁷ One such suitable polymer would be sold under thetradename AqualicTL by Nippon Shoku-bai, Japan. ⁸ Sold by Arch ChemicalsIncorporated, Smyrna, Georgia, USA ⁹ Sold by Rohm and Haas,Philadelphia, Pennsylvania, USA 2.0R Silicate is supplied by PQCorporation, Malvern, PA, USA. Sodium Carbonate is supplied by Solvay,Houston, Texas, USA Sodium percarbonate (2Na₂CO₃•3H₂O₂) supplied bySolvay, Houston, Texas, USA Hydroxyethane di phosphonate (HEDP) issupplied by Dow Chemical, Midland, Michigan, USADishwash Detergent Compositions

The enzyme of the invention may also be used in dish wash detergentcompositions, including the following:

1) POWDER AUTOMATIC DISHWASHING COMPOSITION

Nonionic surfactant 0.4-2.5%  Sodium metasilicate 0-20% Sodiumdisilicate 0-20% Sodium triphosphate 0-40% Sodium carbonate 0-20% Sodiumperborate  2-9% Tetraacetyl ethylene diamine (TAED)  1-4% Sodium sulfate5-33% Enzymes 0.0001-0.1%    2) POWDER AUTOMATIC DISHWASHING COMPOSITION

Nonionic surfactant (e.g. alcohol ethoxylate)  1-2% Sodium disilicate0-30% Sodium carbonate 10-50%  Sodium phosphonate  0-5% Trisodiumcitrate dehydrate 0-30% Nitrilotrisodium acetate (NTA) 0-20% Sodiumperborate monohydrate 5-10% Tetraacetyl ethylene diamine (TAED)  1-2%Polyacrylate polymer (e.g. maleic acid/acrylic 6-25% acid co-polymer)Enzymes 0.0001-0.1%     Perfume 0.1-0.5%  Water 5-103) POWDER AUTOMATIC DISHWASHING COMPOSITION

Nonionic surfactant 0.5-2.0%  Sodium disilicate 0-40% Sodium citrate0-55% Sodium carbonate 0-29% Sodium bicarbonate 0-20% Sodium perboratemonohydrate 0-15% Tetraacetyl ethylene diamine (TAED)  0-6% Maleicacid/acrylic acid copolymer  0-5% Clay  0-3% Polyamino acids 0-20%Sodium polyacrylate  0-8% Enzymes 0.0001-0.1%    4) POWDER AUTOMATIC DISHWASHING COMPOSITION

Nonionic surfactant 1-2% Zeolite MAP 15-42%  Sodium disilicate 0-34% Sodium citrate 0-12%  Sodium carbonate 0-20%  Sodium perboratemonohydrate 7-15%  Tetraacetyl ethylene diamine (TAED) 0-3% Polymer 0-4%Maleic acid/acrylic acid copolymer 0-5% Organic phosphonate 0-4% Clay0-2% Enzymes 0.0001-0.1%    Sodium sulfate Balance

5) POWDER AUTOMATIC DISHWASHING COMPOSITION

Nonionic surfactant  1-7% Sodium disilicate  0-30% Trisodium citrate 0-24% Sodium carbonate 12-20%  Monopersulfate (2 KHSO₅•KHSO₄•K₂SO₄)15-21%  Bleach stabilizer 0.1-2% Maleic acid/acrylic acid copolymer 0-6% Diethylene triamine pentaacetate, pentasodium salt 0-2.5% Enzymes0.0001-0.1%    Sodium sulfate, water Balance6) POWDER AND LIQUID DISHWASHING COMPOSITION WITH CLEANING SURFACTANTSystem

Nonionic surfactant 0-1.5%  Octadecyl dimethylamine N-oxide dihydrate0-5% 80:20 wt. C18/C16 blend of octadecyl dimethyl- 0-4% amine N-oxidedihydrate and hexadecyldimethyl amine N-oxide dehydrate 70:30 wt.C18/C16 blend of octadecyl bis 0-5% (hydroxyethyl)amine N-oxideanhydrous and hexadecyl bis (hydroxyethyl)amine N-oxide anhydrousC₁₃-C₁₅ alkyl ethoxysulfate with an average 0-10%  degree ofethoxylation of 3 C₁₂-C₁₅ alkyl ethoxysulfate with an average 0-5%degree of ethoxylation of 3 C₁₃-C₁₅ ethoxylated alcohol with an average0-5% degree of ethoxylation of 12 A blend of C₁₂-C₁₅ ethoxylatedalcohols with 0-6.5%  an average degree of ethoxylation of 9 A blend ofC₁₃-C₁₅ ethoxylated alcohols with 0-4% an average degree of ethoxylationof 30 Sodium disilicate 0-33%  Sodium tripolyphosphate 0-46%  Sodiumcitrate 0-28%  Citric acid 0-29%  Sodium carbonate 0-20%  Sodiumperborate monohydrate 0-11.5%   Tetraacetyl ethylene diamine (TAED) 0-4%Maleic acid/acrylic acid copolymer 0-7.5%  Sodium sulfate 0-12.5%  Enzymes 0.0001-0.1%   7) NON-AQUEOUS LIQUID AUTOMATIC DISHWASHING COMPOSITION

Liquid nonionic surfactant (e.g. alcohol ethoxylates) 2.0-10.0%  Alkalimetal silicate 0-15.0% Alkali metal phosphate 0-40.0% Liquid carrierselected from higher glycols, 25.0-45.0%   polyglycols, polyoxides,glycolethers Stabilizer (e.g. a partial ester of phosphoric acid0.5-7.0%  and a C₁₆-C₁₈ alkanol) Foam suppressor (e.g. silicone)  0-1.5%Enzymes 0.0001 -0.1%  8) NON-AQUEOUS LIQUID DISHWASHING COMPOSITION

Liquid nonionic surfactant (e.g. alcohol ethoxylates) 2.0-10.0% Sodiumsilicate  0-15.0% Alkali metal carbonate 7.0-20.0% Sodium citrate  0-1.5% Stabilizing system (e.g. mixtures of finely divided  0.5-7.0%silicone and low molecular weight dialkyl polyglycol ethers) Lowmolecule weight polyacrylate polymer 5.0-15.0% Clay gel thickener (e.g.bentonite)  0-10.0% Hydroxypropyl cellulose polymer   0-0.6% Enzymes0.0001-0.1%  Liquid carrier selected from higher lycols, polyglycols,Balance polyoxides and glycol ethers9) THIXOTROPIC LIQUID AUTOMATIC DISHWASHING COMPOSITION

C₁₂-C₁₄ fatty acid 0-0.5% Block co-polymer surfactant 1.5-15.0%   Sodiumcitrate  0-12% Sodium tripolyphosphate  0-15% Sodium carbonate  0-8%Aluminium tristearate 0-0.1% Sodium cumene sulfonate 0-1.7% Polyacrylatethickener 1.32-2.5%   Sodium polyacrylate 2.4-6.0%  Boric acid 0-4.0%Sodium formate 0-0.45%  Calcium formate 0-0.2% Sodium n-decydiphenyloxide disulfonate 0-4.0% Monoethanol amine (MEA) 0-1.86%  Sodiumhydroxide (50%) 1.9-9.3%  1,2-Propanediol 0-9.4% Enzymes 0.0001-0.1%   Suds suppressor, dye, perfumes, water Balance10) LIQUID AUTOMATIC DISHWASHING COMPOSITION

Alcohol ethoxylate 0-20% Fatty acid ester sulfonate 0-30% Sodium dodecylsulfate 0-20% Alkyl polyglycoside 0-21% Oleic acid 0-10% Sodiumdisilicate monohydrate 0-33% Sodium citrate dehydrate 0-33% Sodiumstearate 0-2.5%  Sodium perborate monohydrate 0-13% Tetraacetyl ethylenediamine (TAED)  0-8% Maleic acid/acrylic acid copolymer  4-8% Enzymes0.0001-0.1%    11) LIQUID AUTOMATIC DISHWASHING COMPOSITION CONTAINING PROTECTED BLEACHParticles

Sodium silicate 5-10% Tetrapotassium pyrophosphate 0-25% Sodiumtriphosphate  0-2% Potassium carbonate  4-8% Protected bleach particles,e.g. chlorine 5-10% Polymeric thickener 0.7-1.5%  Potassium hydroxide 0-2% Enzymes 0.0001-0.1%     Water Balance12) Automatic dishwashing compositions as described in 1), 2), 3), 4),6) and 10), wherein perborate is replaced by percarbonate.13) Automatic dishwashing compositions as described in 1)-6) whichadditionally contain a manganese catalyst. The manganese catalyst may,e.g., be one of the compounds described in “Efficient manganesecatalysts for low-temperature bleaching”, Nature, 369, 1994, pp.637-639.

INDUSTRIAL APPLICATION

The present invention is also directed to methods for using thealpha-amylase variants.

The variant alpha-amylase are preferably incorporated into and/or usedtogether with detergent compositions, for example in laundry detergentcompositions, for example household laundry detergent compositions,especially liquid laundry detergent compositions. In particular thedetergent comprises at least one chelating agent and the detergentcomposition typically comprises conventional detergent ingredients suchas surfactants (anionic, cationic, nonionic, zwitterionic, amphoteric),builders, bleaches, polymers, other enzymes and other ingredients, e.g.as described in WO 2007/130562 and WO 2007/149806, which are herebyincorporated by reference in its entirety.

Owing to their activity at alkaline pH values, the α-amylases of theinvention are well suited for use in a variety of industrial processes,in particular the enzyme finds potential applications as a component inwashing, dishwashing and hard surface cleaning detergent compositions,but it may also be useful in the production of sweeteners, syrup such asglucose and the like, plastic precursors, a fermentation product,especially ethanol, butanol and methanol, and biogas such as methane orany other product originating from starch. Conditions for conventionalstarch-converting processes and liquefaction and/or saccharificationprocesses are described in, for instance, U.S. Pat. No. 3,912,590 and EPpatent publications Nos. EP 252,730 and EP 63,909.

The alpha-amylase variants of the invention may also be used in theproduction of lignocellulosic materials, such as pulp, paper andcardboard, from starch reinforced waste paper and cardboard, especiallywhere repulping occurs at pH above 7 and where amylases can facilitatethe disintegration of the waste material through degradation of thereinforcing starch. The alpha-amylase variants of the invention may alsobe useful in modifying starch where enzymatically modified starch isused in papermaking together with alkaline fillers such as calciumcarbonate, kaolin and clays.

Thus the above described compositions may further comprise non-detergentcomponents, a fermenting organism such as e.g. yeast preferably a strainof Saccharomyces, a plant material or starch-containing material such ase.g. tubers, roots, stems, whole grains, corns, cobs, wheat, barley,rye, milo, sago, cassava, tapioca, sorghum, rice peas, beans, or sweetpotatoes, or mixtures thereof, or cereals, sugar-containing rawmaterials, such as molasses, fruit materials, sugar cane or sugar beet,potatoes, and cellulose-containing materials, such as wood or plantresidues, or mixtures thereof.

The alpha-amylase variants of the invention may also be useful intextile desizing. In the textile processing industry, alpha-amylases aretraditionally used as auxiliaries in the desizing process to facilitatethe removal of starch-containing size which has served as a protectivecoating on weft yarns during weaving.

Complete removal of the size coating after weaving is important toensure optimum results in the subsequent processes, in which the fabricis scoured, bleached and dyed. Enzymatic starch break-down is preferredbecause it does not involve any harmful effect on the fibre material.

In order to reduce processing cost and increase mill throughput, thedesizing processing is sometimes combined with the scouring andbleaching steps. In such cases, non-enzymatic auxiliaries such as alkalior oxidation agents are typically used to break down the starch, becausetraditional alpha-amylases are not very compatible with high pH levelsand bleaching agents. The non-enzymatic breakdown of the starch sizedoes lead to some fibre damage because of the rather aggressivechemicals used.

Accordingly, it would be desirable to use the alpha-amylase variants ofthe invention as they have an improved performance in alkalinesolutions. The alpha-amylase variants may be used alone or incombination with a cellulase when desizing cellulose-containing fabricor textile.

In one embodiment, the present invention relates to products for and/ormethods relating to and/or use of the claimed compositions that are notfor air care. In one embodiment, the present invention relates toproducts for and/or methods relating to and/or use of the claimedcompositions that are not for car care. In one embodiment, the presentinvention relates to products for and/or methods relating to and/or useof the claimed compositions that are not for dishwashing. In oneembodiment, the present invention relates to products for and/or methodsrelating to and/or use of the claimed compositions that are not forfabric conditioning (including softening). In one embodiment, thepresent invention relates to products for and/or methods relating toand/or use of the claimed compositions that are not for laundrydetergency. In one embodiment, the present invention relates to productsfor and/or methods relating to and/or use of the claimed compositionsthat are not for laundry and rinse additive and/or care. In oneembodiment, the present invention relates to products for and/or methodsrelating to and/or use of the claimed compositions that are not for hardsurface cleaning and/or treatment and other cleaning for consumer orinstitutional use. In one embodiment, the present invention relates toproducts for and/or methods relating to and/or use of the claimedcompositions that are not for air care, car care, dishwashing, fabricconditioning (including softening), laundry detergency, laundry andrinse additive and/or care, hard surface cleaning and/or treatment, andother cleaning for consumer or institutional use.

Materials and Methods

Enzymes:

SP722: SEQ ID NO: 6, available from Novozymes, and disclosed in WO95/26397.

SP707 or #707: SEQ ID NO: 8

AA560: SEQ ID NO: 10

General Molecular Biology Methods:

Unless otherwise mentioned the DNA manipulations and transformationswere performed using standard methods of molecular biology (Sambrook etal. (1989); Ausubel et al. (1995); Harwood and Cutting (1990).

Fermentation of Alpha-Amylases and Variants

Fermentation may be performed by methods well known in the art or asfollows. A B. subtilis strain harboring the relevant expression plasmidis streaked on a LB-agar plate with a relevant antibiotic, and grownovernight at 37° C.

The colonies are transferred to 100 ml BPX media supplemented with arelevant antibiotic (for instance 10 mg/I chloroamphinicol) in a 500 mlshaking flask.

Composition of BPX Medium:

Potato starch 100 g/l Barley flour 50 g/l BAN 5000 SKB 0.1 g/l Sodiumcaseinate 10 g/l Soy Bean Meal 20 g/l Na₂HPO₄, 12 H₂O 9 g/l Antifoamingagent 0.1 g/l

The culture is shaken at 37° C. at 270 rpm for 4 to 5 days.

Cells and cell debris are removed from the fermentation broth bycentrifugation at 4500 rpm in 20-25 minutes. Afterwards the supernatantis filtered to obtain a completely clear solution. The filtrate isconcentrated and washed on an UF-filter (10000 cut off membrane) and thebuffer is changed to 20 mM Acetate pH 5.5, e.g. by dialysis orgelfiltration. The UF-filtrate is applied on a S-sepharose F.F. (GeneralElectric, Cation exchange, Matrix: Cross-linked agarose, functionalgroup: —OCH₂CHOHCH₂OCH₂CH₂CH₂SO₃) and elution is carried out by stepelution with 0.2 M NaCl in the same buffer. The eluate is dialysedagainst 10 mM Tris (2-amino-2-hydroxymethyl-propane-1,3-diol), pH 9.0and applied on a Q-sepharose F.F. (General Electric, anion exchange,Matrix: cross-linked agarose, functional group:—OCH₂CHOHCH₂OCH₂CHOHCH₂N+(CH₃)₃), and eluted with a linear gra-dientfrom 0-0.3M NaCl over 6 column volumes. The fractions, which contain theactivity (measured by the EnzCheck assay) are pooled, pH is adjusted topH 7.5 and remaining color is removed by a treatment with 0.5% w/vol.active coal in 5 minutes. It may further be advantageous to add afurther buffer exchange step, e.g. by dialysis or gelfiltration to abuffer system that does not affect the wash result in itself, e.g. to anEPPS-buffer, a glycine-buffer, an acetate buffer or the like, preferablywith a small concentration of calcium (e.g. 0.1 mM) to stabilize theamylase during storage and about 0.01% TRITON™ X-100 to reduce risk ofadsorption of enzyme protein to containers and pipettes.

Model Detergent

Composition of Model Detergent A:

Amount % active Compound g/100 g ingredient Surfactants Na-LAS (92%)(Nacconol 90G) 10.87 10 (anionic) (linear al- kylbenzene sulfonate)STEOL CS-370E (70%) (anionic), 7.14 5 CH₃(CH₂)_(m)—(OCH₂CH₂)₃—OSO₃—,where m = 11-13 Bio-soft N25-7 (99.5%) (non-ionic),: 5 5CH₃(CH₂)_(m)—(OCH₂CH₂)₇—OH, where and m = 11-14 Oleic acid (fatty acid)2 2 Solvents H₂O 62 65 Ethanol 0.5 0.5 STS (sodium p-toluene sulfonate(40%)) 3.75 1.5 Mono propylene glycol 2 2 Builder Tri-sodium-citrate 4 4Triethanolamine (TEA) 0.5 0.5 Stabilizer Boric acid 1.5 1.5 Minors 10NNaOH (for adjustment to pH 8.5) 0.8 0.8Composition of Model Detergent B:

Amount % active Compound g/100 g ingredient Surfactants Na-LAS (92%)(Nacconol 90G) (anionic) 10.87 10 STEOL CS-370E (70%) (anionic) 7.14 5Bio-soft N25-7 (99.5%) (non-ionic) 5 5 Oleic acid (fatty acid) 2 2Solvents H₂O 62 65 Ethanol 0.5 0.5 STS (sodium p-toluene sulfonate (40%)3.75 1.5 Mono propylene glycol 2 2 Builder Diethylene triamine pentaacetic acid (DTPA) 1.5 1.5 Triethanolamine (TEA) 0.5 0.5 StabilizerBoric acid 1.5 1.5 Minors 10N NaOH (for adjustment to pH 8.0) 0.8 0.8Assay for Measurement of Free Calcium Ions

The following assay may be used for the measurement of free calcium ionsin solution, and thus for the determination of chelating agents(chelants) ability to reduce the concentration of free calcium ions(Ca²⁺) from e.g. 2.0 mM to 0.10 mM at pH 8.

Assay Principle:

Various amounts of chelants are added to a solution of 2.0 mM Ca′ andthe free Ca²⁺ concentration is determined by using a Calcium IonSelective Electrode at fixed pH and temperature. The concentration ofchelant necessary to reduce the concentration of free calcium from 2.0mM to 0.10 mM can be determined from a plot of the free calciumconcentration measured versus the concentration of chelant. In thepresent assay the concentration of chelant necessary to reduce theconcentration of free calcium from 2.0 mM to 0.10 mM is measured at pH8, at 21° C., in potassium chloride and 49 mM EPPS.

Solutions:

Electrolyte solution: 4 M potassium chloride in ultrapure water (Milli-Qwater).

pH 8 buffer: 50 mM EPPS (4-(2-Hydroxyethyl)piperazine-1-propanesulfonicacid) adjusted to pH 8.0 using minimum amounts of 1 N sodium hydroxide.

Calcium stock solution: 25 mM Ca²⁺ in pH 8 buffer, made from CaCl₂.2H₂O.

Chelant stock solution: 15 mM chelant (on a 100% dry chelator basis) inpH 8 buffer, re-adjusted to pH 8.0 using minimum amounts of 1 M NaOH or1 M HCl.

Ultra pure water (Milli Q water) is used for preparation of all buffersand solutions.

Equipment:

Calcium Ion Selective Electrode from Thermo Scientific (cat. No.9720BNWP) calibrated against a Calcium chloride standard solution. Theelectrode is calibrated as described by the guidelines following theelectrode.

Procedure:

A series of vials are prepared, each containing 4 mL of the calciumstock solution (final concentration 2.0 mM), 1 mL electrolyte solution(final concentration 80 mM potassium chloride), chelant stock solutionin various amounts (0-45 mL) and using the pH 8 buffer for adjusting thetotal volume to 50 mL. The final concentration of EPPS in the assay is49 mM.

After mixing, the concentration of free Ca²⁺ is measured by the calciumelectrode. The free calcium concentration should be determined at asufficient number of different chelant concentrations for each chelanttested, ensuring that the data set covers the entire range from 2.0 mMfree calcium ions to a value below 0.10 mM or the final chelantconcentration in the assay is higher than 10.0 mM. A suitable number ofdata points are 8 or more. The chelant concentration required to lowerthe initial 2.0 mM free calcium ions to 0.10 mM is obtained from a plotof the measured free calcium ion concentration versus chelatorconcentration by interpolation.

The solutions are equilibrated to the desired temperature, which in thepresent assay is 21° C.

Determination of log K

Chelating agents can also be characterized by the binding constant ofthe chelating agent (chelator) and calcium ions. This constant can bedetermined by ITC (isothermal titration calorimetry) as described by A DNielsen, C C Fuglsang and P Westh, Analytical Biochemistry Vol. 314(2003) page 227-234 and T Wiseman, S Williston, J F Brandts and L-N Lin,Analytical Biochemistry Vol. 179 (1989) page 131-137.

All glassware and plastic bottles used are washed with a 1% (w/w) EDTAsolution and subsequently rinsed thoroughly in Chelex 100 treatedultrapure water (Milli-Q water). Solutions are stored in plastic bottlesand kept at 5° C. until use.

Buffers:

20 mM HEPES (2-[4-(2-hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid),pH 8 prepared with ultrapure water (Milli-Q water)

20 mM glycine, pH 10 prepared with ultrapure water (Milli-Q water)

Solutions:

-   -   125 μM chelant in 20 mM HEPES, pH 8 or 125 μM chelant in 20 mM        glycine, pH 10    -   4 mM CaCl₂) in 20 mM HEPES, pH 8 or 4 mM CaCl₂) in 20 mM        glycine, pH 10    -   Ultrapure water (Milli-Q water)

All buffers are passed through Chelex 100 columns (Sigma Aldrich C-7901,matrix 1% cross-linked polystyrene matrix active group iminodiaceticacid (sodium form) matrix attachment through methyl group to aromaticrings) to remove calcium ions. All solutions are degassed by stirringunder vacuum before the experiments.

Instrument:

MCS-ITC (MicroCal Inc., Northampton, Mass., USA)

Procedure

The reference cell is filled with ultrapure water (Milli-Q water). Thesample cell is filled with the chelant solution at the selected pH andthe syringe is filled with the calcium solution at the selected pH. Thesolutions are equilibrated to the desired temperature, e.g. 19° C.

The chelator solution in the sample cell is then titrated with 30-40aliquots of 8 μL of the calcium solution.

The obtained signals from the ITC are then integrated using the Originsoftware supplied by MicroCal Inc. To obtain the binding isotherms,regression routines are made using the same software package. These dataare then fitted to a model using the routines embedded in the Originsoftware. Presently preferred is the “OneSites” model which gives thebest fit for most of the commonly used chelating agents, i.e. theresiduals are evenly distributed around zero. From the K value the log Kis calculated as the logarithm (base 10) of the K value.

Assays for Determining Wash Performance

In order to assess the wash performance of the alpha-amylase variants ina detergent composition, washing experiments may be performed. Theenzymes are tested using the Automatic Mechanical Stress Assay (AMSA) orthe wash performing test using beakers. With the AMSA test the washperformance of a large quantity of small volume enzyme-detergentsolutions can be examined. The AMSA plate has a number of slots for testsolutions and a lid firmly squeezing the textile swatch to be washedagainst all the slot openings. During the washing time, the plate, testsolutions, textile and lid are vigorously shaken to bring the testsolution in contact with the textile and apply mechanical stress in aregular, periodic oscillating manner. For further description see WO02/42740, especially the paragraph “Special method embodiments” at page23-24.

General Wash Performance Description:

A test solution comprising water (15° dH), 0.8 g/L detergent, e.g. modeldetergent A or B as described above, or 50 mM HCO3-, and the enzyme ofthe invention, e.g. at concentration of 0, 0.2, 0.4, 0.8 and/or 1.2 mgenzyme protein/L, is prepared. Fabrics stained with starch (e.g. CS-28from Center For Testmaterials BV, P.O. Box 120, 3133 KT, Vlaardingen,The Netherlands) is added and washed for 30 minutes at 20° C. Afterthorough rinse under running tap water and drying in the dark, the lightintensity or reflectance values of the stained fabrics are subsequentlymeasured as a measure for wash performance. The test with 0 mg enzymeprotein/L is used as a blank to obtain a delta remission value.Preferably mechanical action is applied during the wash step, e.g. inthe form of shaking, rotating or stirring the wash solution with thefabrics.

The AMSA wash performance experiments may be conducted under theexperimental conditions specified below:

Detergent Model detergent A or B Detergent dosage 0.8 g/L Test solutionvolume 160 micro L pH As is Wash time 30 minutes Temperature 20° C.Water hardness 15° dH Enzyme concentration in test solution 0; 0.2; 0.4;0.8; 1.2 mg/L Test material CS-28 (Rice starch on cotton)

Water hardness was adjusted to 15° dH by addition of CaCl2, MgCl₂, andNaHCO₃ (Ca²⁺:Mg²⁺:HCO₃ ⁻=4:1:7.5, molar basis) to the test system. Afterwashing the textiles were flushed in tap water and dried in the dark.

The performance of the enzyme variant is measured as the brightness ofthe color of the textile washed with that specific amylase. Brightnesscan also be expressed as the intensity of the light reflected from thesample when illuminated with white light. When the sample is stained theintensity of the reflected light is lower, than that of a clean sample.Therefore, the intensity of the reflected light can be used to measurewash performance of an amylase.

Color measurements are made with a professional flatbed scanner (KodakiQsmart, Kodak), which is used to capture an image of the washedtextile.

To extract a value for the light intensity from the scanned images,24-bit pixel values from the image are converted into values for red(r), green (g) and blue (b), also known as RGB value. The intensityvalue (Int) is calculated by adding the RGB values together as vectorsand then taking the length of the resulting vector:

${Int} = {\sqrt{r^{2} + g^{2} + b^{2}}.}$Textiles: Textiles sample CS-28 (rice starch on cotton) can be obtainedfrom Center For Test materials BV, P.O. Box 120, 3133 KT Vlaardingen,the Netherlands.

The wash performance test using beakers is an assay in a small scalemodel of a top loaded washing machine and used to evaluate the washingperformance of amylases. The beaker wash performance test, using 250 mLbeakers and a paddle stirrer providing oscillating rotational motion,180° in each direction, with a frequency of 80 per minute, comprises thefollowing steps: providing 100 mL wash solution (6° C., 15° dH, pH 8.0)containing 50 mM NaHCO₃ and 0.4 mg/L enzyme; adding two swatches ofCS-28 (5×5 cm) and two swatches of EMPA 162 (5×5 cm) to the washsolution to start the wash; setting the agitation speed to 80 rpm;stopping the agitation after 60 minutes, rinsing the swatches under coldrunning tap water; drying the rinsed swatches in the dark over night;and evaluating the wash performance by measuring the remission ofincident light at 460 nm using Color Eye as described below.

Equipment and Materials

Water bath (5° C.) with circulation; glass beakers (250 mL); onerotating arm per beaker with capacity of 100 mL of washing solution;test swatches: CS-28 (rice starch on cotton) from Center forTestmaterials BV, Vlaardingen, The Netherlands and EMPA 162 (rice starchon cotton/poly-ester) from EMPA Testmaterials AG, St. Gallen,Switzerland, the swatches are cut into 5×5 cm.

Wash solution: 50 mM NaHCO₃ buffer, pH 8.0, water hardness: 15° dH,Calcium:Magnesium ratio 4:1.

Amylase stock solution: 1 mg enzyme protein per mL.—A solution of 0.1%(w/v) Triton X-100 and 0.1 mM CaCl₂ in ultrapure water (MilliQ water) isused for dilution of amylase (amylase dilution buffer).

Color Eye Measurement

Wash performance is expressed as a delta remission value (ΔRem). Lightreflectance evaluations of the swatches were done using a Macbeth ColorEye 7000 reflectance spectrophotometer with very small oval aperture,i.e. 0.7 cm² (˜0.7×1.0 cm). The measurements were made without UV in theincident light and remission at 460 nm was extracted. The swatch to bemeasured was placed on top of another swatch of the same type beforebeing measured to reduce reflection from the piston pushing the swatchup against the measuring opening. Delta remission values for individualswatches were calculated by subtracting the remission value of theswatch washed without added amylase (control) from the remission valueof the swatch washed with amylase.Assays for Measurement of Amylolytic Activity (Alpha-Amylase Activity)EnzChek Assay

The amylase activity or residual amylase activity can be determined bythe following EnzCheck assay. The substrate is a corn starch derivative,DQ™ starch (corn starch BODIPY FL conjugate), which is corn starchlabeled with BODIPY® FL(4,4-difluoro-5,7-dimethyl-4-bora-3a,4a-diaza-s-indacene-3-propionicacid) dye to such a degree that the fluorescence is quenched. One vialcontaining approx. 1 mg lyophilized substrate is dissolved in 100 μL 50mM sodium acetate pH 4.0. The vial is vortexed for 20 seconds and leftat room temperature, in the dark, with occasional mixing untildissolved. Then 950 μL 10 mM sodium acetate, 0.01% (w/V) TRITON™ X100((polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether(C₁₄H₂₂O(C₂H₄O)_(n) (n=9-10)), pH 5.0 is added, vortexed thoroughly andstored at room temperature, in the dark until ready to use. From 1 mL ofthis solution, the substrate working solution was prepared by mixingwith 5 mL 50 mM HEPES, 0.01% (w/V) TRITON™ X100, 1 mM CaCl₂, pH 7.0.

The enzyme containing detergent is diluted to a concentration of 15 ngenzyme protein/ml (6826.7 times dilution) in 50 mM HEPES, 0.01% TRITON™X100, 1 mM CaCl₂, pH 7.0. For the assay, 25 μL of the substrate workingsolution is mixed for 10 second with 25 μL of the diluted enzyme in ablack 384 well microtiter plate. The fluorescence intensity is measured(exci-tation: 485 nm, emission: 555 nm) once every second minute for 30minutes in each well at 25° C. and the V_(max) is calculated as theslope of the plot of fluorescence intensity against time. The plotshould be linear and the residual activity assay has to been adjusted sothat the diluted reference enzyme solution is within the linear range ofthe activity assay.

In a few instances there is a significant interference from thedetergent without amylase on the assay. In such cases alternativeamylase assays can be used. Interference from a detergent on an amylaseassay can be tested by adding a known amount of amylase to the detergentat two levels and then measure the activity of the two samples. If thedifference in the measured activities corresponds to the differences inthe levels between the added amylases, the assay can be used todetermine the residual activity of the amylase after storage.

PNP-G7 Assay

The alpha-amylase activity may be determined by a method employing thePNP-G7 substrate. PNP-G7 which is an abbreviation for4,6-ethylidene(G₇)-p-nitrophenyl(G₁)-α,D-maltaheptaoside, a blockedoligosaccharide which can be cleaved by an endo-amylase, such as analpha-amylase. Following the cleavage, the alpha-Glucosidase included inthe kit digest the hydrolysed substrate further to liberate a free PNPmolecule which has a yellow color and thus can be measured by visiblespectophometry at X=405 nm (400-420 nm.). Kits containing PNP-G7substrate and alpha-Glucosidase is manufactured by Roche/Hitachi (cat.No. 11876473).

Reagents:

The G7-PNP substrate from this kit contains 22 mM 4,6-ethylidene-G7-PNPand 52.4 mM HEPES (2-[4-(2-hydroxyethyl)-1-piperazinyl]-ethanesulfonicacid), pH 7.0).

The alpha-Glucosidase reagent contains 52.4 mM HEPES, 87 mM NaCl, 12.6mM MgCl₂, 0.075 mM CaCl₂, ≥4 kU/L alpha-glucosidase).

The substrate working solution is made by mixing 1 mL of thealpha-Glucosidase reagent with 0.2 mL of the G7-PNP substrate. Thissubstrate working solution is made immediately before use.

Dilution buffer: 50 mM EPPS, 0.01% (w/v) TRITON™ X100 (polyethyleneglycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether (C₁₄H₂₂O(C₂H₄O),(n=9-10))), 1 mM CaCl2), pH7.0.

Procedure:

The amylase sample to be analyzed was diluted in dilution buffer toensure the pH in the diluted sample is 7. The assay was performed bytransferring 20 μl diluted enzyme samples to 96 well microtiter plateand adding 80 μl substrate working solution. The solution was mixed andpre-incubated 1 minute at room temperature and absorption is measuredevery 20 sec. over 5 minutes at OD 405 nm.

The slope (absorbance per minute) of the time dependent absorption-curveis directly propor-tional to the specific activity (activity per mgenzyme) of the alpha-amylase in question under the given set ofconditions. The amylase sample should be diluted to a level where theslope is below 0.4 absorbance units per minute.

Determination of Percentage Point (Pp)

The percentage point (pp) improvement in residual activity (stability)of the variant relative to the parent is calculated as the differencebetween the residual activity of the variant and the residual activityof the parent, i.e. the residual activity of the variant minus theresidual activity of the parent.

EXAMPLES Example 1: Preparation of Variants

The Amylase variants of SEQ ID NO: 6 (SP722) were prepared by standardprocedures, in brief: Introducing random and/or site-directed mutationsinto the gene, transforming Bacillus subtilis host cells with themutated genes, fermenting the transformed host cells (e.g. as describedin Example 1 of WO 2004/111220), and purifying the amylase from thefermentation broth. The reference amylase (SEQ ID NO: 6) was producedrecombinantly in Bacillus subtilis in a similar manner.

Example 2: Characterization of Chelating Agents Example 2a

Measure of Free Calcium Ions

Chelating agents (chelants) may be ranked by their ability to reduce theconcentration of free calcium ions (Ca²⁺) from 2.0 mM to 0.10 mM at pH 8developed from a method described by M. K. Nagarajan et al., JAOCS, Vol.61, no. 9 (September 1984), pp. 1475-1478. The assay is described aboveunder “Materials and Methods” for measuring of free calcium ions wasused.Accordingly, the concentration of chelant necessary to reduce thewater hardness from 2.0 mM to 0.10 mM was determined as described above.The experiment was carried out with the pH 8 buffer at 21° C.

The final concentrations of chelant used and the free Ca²⁺ concentrationmeasured are shown in table 2.1 below.

TABLE 2.1 Concentration of free Ca²⁺ determined in a mixture of 2.0 mMCa²⁺ and various amounts of chelating agent at pH 8. mL mL mL mM Calciumelectrolyte pH 8 mL chelant final stock solution solution buffer chelantconcentration 4 1 45.0 0.0 0.00 4 1 44.0 1.0 0.30 4 1 43.0 2.0 0.60 4 141.0 4.0 1.20 4 1 39.0 6.0 1.80 4 1 38.5 6.5 1.95 4 1 38.0 7.0 2.10 4 137.5 7.5 2.25 4 1 37.0 8.0 2.40 4 1 36.5 8.5 2.55 4 1 36.0 9.0 2.70 4 135.5 9.5 2.85 4 1 35.0 10.0 3.00 4 1 32.5 12.5 3.75 4 1 30.0 15.0 4.50 41 25.0 20.0 6.00 4 1 20.0 25.0 7.50 4 1 15.0 30.0 9.00 4 1 10.0 35.010.50From these data, the concentration of chelating agent necessary toreduce the free Ca²⁺ concentration from 2.0 mM to below 0.10 mM weredetermined by interpolation.

A number of chelants were characterized using this assay and thechelator concentrations necessary to reduce the concentration of freecalcium ions from 2.0 mM to 0.10 mM at pH 8.0 in 49 mM EPPS buffer and80 mM potassium chloride are shown in Table 2.2.

TABLE 2.2 mM Relative to citrate Citrate 8.36 1.00 EGTA 2.60 0.33 EDTA1.90 0.21 HEDP 1.60 0.20 DTPA 1.87 0.24 DTPMP 1.17 0.15 MGDA 2.56 0.33

Example 2b

Determination of log K

Alternatively the chelating agents can be characterized by the bindingconstant of the chelating agent (chelator) and calcium ions. Thisconstant can be determined by ITC (isothermal titration calorimetry) asdescribed by A D Nielsen, C C Fuglsang and P Westh, AnalyticalBiochemistry Vol. 314 (2003) page 227-234 and T Wiseman, S Williston, JF Brandts and L-N Lin, Analytical Biochemistry Vol. 179 (1989) page131-137. The procedure for the determination of log K is described indetail above under “Materials and Methods”.

Using this procedure for determination of log K, the following log Kvalues for several chelating agents were determined at pH 10 (Table2.3).

TABLE 2.3 Log K Log K relative to log K for citrate Citrate 3 1.00 EGTA9 3.0 EDTA 8 2.7 HEDP 6 2.0 DTPA 7 2.7 MGDA 5 1.3

Example 3: Residual Activity after Incubation with Chelating Agent

EnzChek Assay

The amylase activity or residual amylase activity is in the presentinvention determined by the EnzCheck assay as described above. Ingeneral the residual amylase activity in model detergent B wasdetermined after incubation at 31° C. for 18 hours the activity was thencompared to the activity of a reference incubated at 4° C. for 18 hoursas described above.

Test of the Stability of Amylase Variants in Detergent with 1.5% DTPA asChelant

For the determination of the amylase stability in detergent the enzymesto be tested were adjusted to a concentration of 0.6 mg/mL of enzymeprotein by dilution in 20 mM HEPES, 0.1% (w/V) Triton X100, pH 8.0. Ifthe starting amylase concentration is too low, it can be concentrated,by ultra filtration (UF) using a UF membrane with a cut off of 10 kDa.

25 μL of the amylase solution and 125 μL detergent (model detergent B)were transferred to a 96 well microtiter plate in 4 replicates. Onesmall magnet (5×2 mm) was placed in each well, and the blend was mixedfor 5 minutes at room temperature on a magnetic stirrer. Two identicalplates were prepared. One of the plates was incubated at 4° C. for 18hours (reference sample) and the other plate was incubated at 31° C. for18 hours (31° C. sample).

Immediately after incubation, the samples on the plates were analyzedfor amylase activity as described in the EnzCheck Assay fordetermination of residual amylase activity in detergents. It should benoted, that in order to reduce interference from other detergentingredients than the enzyme on the assay, both reference and 31° C.sample were diluted to the same protein concentration. The activity ofboth the reference samples and the 31° C. samples were determined onsame 384-well plate. It was ensured that the reference amylase wasincluded on all test microtiter plates The residual activity wascalculated as 100*V_(max)(31° C. sample)/V_(max)(reference sample).

The result is shown in Table 3.1 using either SP722 or SP722+D183* G184*as reference amylase (parent). The percentage point (pp) improvement inresidual activity of the variant relative to the parent is calculated asthe difference between the residual activity of the variant and that ofthe parent.

TABLE 3.1 pp improvement in residual activity relative to parentResidual SP722 + Enzyme activity (%) SP722 D183* G184* SP722 (parent) 120 — SP722 + D183* G184* (parent) 65 53 0 SP722 + D183* G184* N195F 88 7623 SP722 + D183* G184* N195L 79 67 14 SP722 + D183* G184* N197F 95 83 30SP722 + D183* G184* N197L 81 69 16 SP722 + D183* G184* Y243F 80 68 15SP722 + D183* G184* A186R, 79 67 14 N195F SP722 + D183* G184* H210Y 7462 9 SP722 + D183* G184* V206L 91 79 26 SP722 + D183* G184* V213A 87 7522 SP722 + Q174R D183* G184* E212V 83 71 18 SP722 + D183* G184* V206LE212G G304V 80 68 15 A447V SP722 + N116T G133E K142R D183* G184* 90 7825 Y198N V206L SP722 + G133E D183* G184* N195Y Y198N 83 71 18 Y200FSP722 + N116T D183* G184* N195Y Y198N 79 67 14 SP722 + K142R P146S G149KD183* G184* 80 68 15 N195Y Y198N V206I SP722 + D134Y D183* G184* 72 60 7SP722 + T151R D183* G184* H210Y K320N 78 66 13 R359I N418D SP722 + G147EG149R Q169E D183* G184* 87 75 22 Y198N Y203F V206L SP722 + G133E G149RD183* G184* N195Y 91 79 26 Y198N Y203F V206L SP722 + G147E Y152H Q169ED183* G184* 90 78 25 Y198N V206L SP722 + D183* G184* N195F V206L 98 8633 SP722 + D183* G184* N195F Y243F 100 88 35 SP722 + D183* G184* N195FH210Y 93 81 28 SP722 + D183* G184* V206L H210Y 95 83 30 SP722 + D183*G184* V213A 93 81 28 SP722 + D183* G184* S193T 85 73 20 SP722 + D183*G184* A186T N195F 96 84 31 SP722 + D183* G184* N195F V206L Y243F 94 8229 SP722 + D183* G184* V206L Y243F 98 86 33 SP722 + D183* G184* N195Y 9381 28 SP722 + G133D G149R D183* G184* Y198N 92 80 27 V206L SP722 + N116TG133E G147E Y152H D183* 94 82 29 G184* Y198N Y203F V206L SP722 + G147EG149R D183* G184* N195F 96 84 31 Y198N V206L SP722 + G133E K142R D183*G184* N195F 95 83 30 Y198N SP722 + G133E G149R Y152H D183* G184* 97 8532 N195Y Y198N V206L SP722 + N116T Q129L K142R D183* G184* 101 89 36N195Y Y198N Y203F V206L SP722 + G133E G149R Y152H D183* G184* 101 89 36N195Y Y198N Y203F V206L SP722 + N116T G133E G149R D183* G184* 104 92 39Y198N Y203F V206L SP722 + D183* G184* N195F V206Y Y243F 109 97 44SP722 + D183* G184* N195F V206C Y243F 113 101 48 SP722 + D183* G184*N195F V206T Y243F 109 97 44 SP722 + D183* G184* N195F V206N Y243F 99 8734 SP722 + D183* G184* N195F V206C 101 89 36 SP722 + D183* G184* N195FV206H 105 93 40 SP722 + D183* G184* N195F V206Y 110 98 45 SP722 + D183*G184* N195F V206L 111 99 46 SP722 + D183* G184* N195F V206G Y243F 104 9239 SP722 + D183* G184* V206F Y243F 104 92 39 SP722 + D183* G184* N195FV206I Y243F 105 93 40 SP722 + D183* G184* N195F V206F Y243F 92 80 27SP722 + D183* G184* N195F V206S Y243F 104 92 39 SP722 + D183* G184*A186T N195F 103 91 38 SP722 + D183* G184* N195F V206L H210Y 102 90 37SP722 + D183* G184* S193T V206L 101 89 36 SP722 + D183* G184* S193TV213A 108 96 43 SP722 + D183* G184* S193T Y243F 103 91 38 SP722 + D183*G184* N195F V206N 107 95 42

The results clearly show that the variants of the invention areconsiderably more resistant to the presence of strong chelating agentsthan the reference alpha-amylase. In a few instances the residualactivity is above 100, reflecting the analytical variance of the assay.

The results show that the variants of the invention also at pH 8.0 haveimproved stability compared with the reference alpha-amylase, which maybe SEQ ID NO: 6 (SP722) or SEQ ID NO: 6+D183* G184*, which is SEQ ID NO:6 wherein amino acid 183 and 184 has been deleted.

Example 4: Residual Activity after Incubation with Chelating Agent atpH8 and pH10

In this example the above-described PNP-G7 assay is used to determinethe residual amylase activity after incubation in the presence of thechelating agent DTPA, but the principle is the same as above fordetermine activity using the EnzCheck assay. In general the residualamylase activity was determined after incubation in a buffer containinga chelating agent at either pH 8 and 49° C. or pH 10 and 42° C. for 1hour and the activity is then compared to the activity of a referenceincubated at 4° C. for 1 hour as described above under “Materials andMethods”.

Test of Stability of Amylase Variants after Incubation with ChelatingAgent at pH8 and pH10 in Buffer

Principle:

Enzyme samples were incubated in buffer pH 8.0 with 1.5% finalconcentration of DTPA at 49° C. for 1h and reference samples wereincubated at 4° C. for 1h. In addition, enzyme samples were incubated inbuffer pH10.0 with 1.5% final concentration of DTPA at 42° C. for 1h andtheir reference samples were incubated at 4° C. for 1 h. Afterincubation the residual activity was determined using the PNP-G7 amylaseactivity assay.

Reagents:

pH 8 buffer with DTPA: 50 mM EPPS, 0.01% TRITON™ X100, 1.875% DTPA(Diethylene triamine pentaacetic acid, cas no. 67-43-6), pH8.0

pH 10 buffer with DTPA: 50 mM EPPS, 0.01% TRITON™ X100, 1.875% DTPA(Diethylene triamine pentaacetic acid, cas no. 67-43-6), pH 10.0

Amylase solutions: 0.25 and 0.5 mg active amylase protein/mL in 5 mMEPPS, 0.01% TRITON™ X-100, pH 8.0

Procedure:

160 μL buffer (pH 8 buffer with DTPA or pH 10 buffer with DTPA) and 40μL of the amylase solutions were transferred to a 96-well PCR microtiterplate in duplicate and the content was mixed for 1 minutes (PCR:Polymerase Chain Reaction). Final concentration of DTPA was 1.5% in eachwell. 20 μl from each well was transferred to a new PCR microtiter plate(PCR MTP), which was placed at 4° C. (reference sample). The PCR MTP wasincubated in PCR machine for 1h at 49° C. when buffer had pH 8.0 (pH 8,49° C. samples) and for 1h at 42° C. when buffer had pH 10.0 (pH 10, 42°C. samples).

Immediately after incubation, the samples on PCR plates were dilutedten-fold in dilution buffer and analyzed for amylase activity asdescribed in PNP-G7 assay. It should be noted, that in order to reduceinterference from the chelating agent, here DTPA, on the assay, bothreference and pH8, 49° samples/pH10, 42° C. samples were diluted to thesame concentration before being analyzed for residual activity. Theactivity of both the reference samples and the pH8, 49° samples or pH10,42° C. samples were determined on the same 96 well plate. It was ensuredthat the parent amylase was included on all test microtiter plates. Theresidual activity was calculated as 100*V_(max) (pH8, 42° C. or pH10,49° C. sample)/V_(max) (reference sample) and the results are shown intable 4.1. The percentage points (pp) improvements are calculated as theresidual activity of the variant minus the residual activity of theparent.

TABLE 4.1 pH8, 49° C. pH10, 42° C. pp point improvement of ppimprovement of variant relative to parent variant relative to parentResidual SP722 + Residual SP722 + Enzyme activity (%) SP722 D183* 184*activity (%) SP722 D183* 184* SP722 (parent) 1 0 8 0 SP722 + D183* 20 —0 20 — 0 G184* (Parent) SP722 + D183* 97 96 77 93 85 73 G184* N195FV206L Y243F SP722 + D183* 97 96 77 100 92 80 G184* N195F V206Y Y243FSP722 + D183* 96 95 75 92 84 64 G184* N195F V206N Y243F SP722 + D183*101 100 80 97 89 69 G184* N195F V206F Y243F SP722 + D183* 92 92 72 88 8060 G184* N195F V206H SP722 + D183* 95 94 74 96 88 68 G184* N195F V206YSP722 + D183* 87 86 66 89 81 61 G184* V206F Y243F SP722 + D183* 98 97 7796 88 68 G184* N195F V206L H210Y SP722 + D183* 79 78 58 73 65 45 G184*S193T V206L SP722 + D183* 90 89 69 83 75 55 G184* G133E G149R N195YY203F V206L

The results clearly show that the variants of the invention are highlystable and have high residual activity after incubation at pH8 49° C.and pH10 42° C. for 1 hour both when comparing the residual activitiesof the variants with that of the parent and when looking at thepercentage point improvement of the variants. In comparison SP722+D183*G184* amylase has 20% residual activity and SP722 has even less residualactivity.

Example 5: Residual Activity after Incubation in Buffer with 1.5% (w/v)DTPA at pH8 and pH10

In this example the above-described PNP-G7 assay is used to determinethe residual amylase activity SP722 variants after incubation in thepresence of the chelating agent DTPA. In general the residual amylaseactivity was determined after incubation in a buffer containing achelating agent at either pH 8 or pH 10 at the indicated temperaturesand incubation times and the activity is then compared to the activityof a reference incubated at 4° C. as described above under “Materialsand Methods”.

Test of Stability of Amylase Variants after Incubation with ChelatingAgent at pH8 and pH10 in Buffer

Principle:

Enzyme samples were incubated in buffer pH 8.0 with 1.5% (w/v) finalconcentration of DTPA at indicated temperature and incubation time andreference samples were incubated at 4° C. at same incubation time. Inaddition, enzyme samples were incubated in buffer pH10.0 with 1.5% (w/v)final concentration of DTPA at indicated temperature and incubation timeand their reference samples were incubated at 4° C. at same incubationtime. After incubation the residual activity was determined using thePNP-G7 amylase activity assay.Reagents:pH 8 buffer with DTPA: 50 mM EPPS, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) DTPA (Diethylene triamine pentaacetic acid, cas no. 67-43-6),pH8.0pH 10 buffer with DTPA: 50 mM Glycine, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) DTPA (Diethylene triamine pentaacetic acid, cas no. 67-43-6), pH10.0Amylase solutions: 0.25 and 0.5 mg active amylase protein/mL in 5 mMEPPS, 0.01% TRITON™ X-100, pH 8.0Procedure:160 μL buffer (pH 8 buffer with DTPA or pH 10 buffer with DTPA) and 40μL of the amylase solutions were transferred to a 96-well PCR microtiterplate in duplicate and the content was mixed for 1 minutes (PCR:Polymerase Chain Reaction). Final concentration of DTPA was 1.5% (w/v)in each well. 20 μl from each well was transferred to a microtiter plate(MTP), which was placed at 4° C. (reference sample). The PCR MTP(stressed sample) was incubated in PCR machine as indicated in tablebelow.

Immediately after incubation, the samples on PCR plates were dilutedten-fold in dilution buffer and analyzed for amylase activity asdescribed in PNP-G7 assay. It should be noted, that in order to reduceinterference from the chelating agent, here DTPA, on the assay, bothreference and stressed samples were diluted to the same concentrationbefore being analyzed for residual activity. The activity of both thereference samples and the stressed were determined on the same 96 wellplate. It was ensured that the parent amylase was included on all testmicrotiter plates. The residual activity was calculated as 100*V_(max)(stressed sample)/V_(max) (reference sample). The percentage point (pp)improvement in the stability of the variants relative to the parent iscalculated as the residual activity of the variant minus the residualactivity of the parent. The results are shown in table 5.1.

TABLE 5.1 SP722 variants with DTPA chelator pH 8, 49° C., 10 minutes, pH10, 42° C., 20 minutes, 1.5% DTPA 1.5% DTPA Residual pp improvement inresidual Residual pp improvement in residual Enzyme activity (%)activity relative to parent activity (%) activity relative to parentSP722 (parent) 29 0 25 0 SP722 + N195F 51 22 42 17 SP722 + V206L 36 7 327 SP722 + V206Y 48 19 41 16 SP722 + Y243F 34 5 35 10 SP722 + N195F V206L68 39 62 37 SP722 + N195F V206L Y243F 78 49 77 52From the residual activities it is clearly seen that the variants ofSP722 is more stable in the presence of DTPA, which is also reflected inthe percentage points improvements in the stability of the variantcompared to the parent.

Example 6: Residual Activity after Incubation with HEDP at pH 10

In this example the above-described PNP-G7 assay is used to determinethe residual amylase activity after incubation in the presence of thechelating agent HEDP. In general the residual amylase activity wasdetermined after incubation in a buffer containing a chelating agent atpH 10 at the indicated temperatures and incubation times and theactivity is then compared to the activity of a reference incubated at 4°C. as described above under Materials and Methods.

Test of Stability of Amylase Variants after Incubation with ChelatingAgent at pH10 in Buffer

Principle:

Enzyme samples were incubated in buffer pH 10.0 with 1.5% (w/v) finalconcentration of HEDP at indicated temperature and incubation time andreference samples were incubated at 4° C. at same incubation time. Afterincubation the residual activity was determined using the PNP-G7 amylaseactivity assay.Reagents:pH 10 buffer with HEDP: 50 mM Glycine, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) HEDP (1-Hydroxyethylidenediphosphonic acid, cas no 2809-21-4), pH10.0Amylase solutions: 0.25 and 0.5 mg active amylase protein/mL in 5 mMEPPS, 0.01% (w/v) TRITON™ X-100, pH 8.0Procedure:160 μL buffer (pH 10 buffer with HEDP) and 40 μL of the amylasesolutions were transferred to a 96-well PCR microtiter plate induplicate and the content was mixed for 1 minutes (PCR: Polymerase ChainReaction). Final concentration of HEDP was 1.5% (w/v) in each well. 20μl from each well was transferred to a microtiter plate (MTP), which wasplaced at 4° C. (reference sample). The PCR MTP (stressed sample) wasincubated in PCR machine as indicated in table 6.1 below. The residualactivity was calculated as 100*V_(max)(stressedsample)/V_(max)(reference sample). The percentage point (pp) improvementin the stability of the variants relative to the parent is calculated asthe residual activity of the variant minus the residual activity of theparent.

TABLE 6.1 SP722 and variant thereof with HEDP pH 10, 42° C., 20 minutes,1.5% HEDP Residual pp improvement Enzyme activity (%) relative to parentSP722 (parent) 44 0 SP722 + N195F V206L Y243F 76 32The results clearly show that the variant is more stable when incubatedin the presence of HEDP compared to the parent.

Example 7: Stability of SP722+D183* G184* and Variants Thereof with 1.5%(w/v) HEDP

In this example the above-described PNP-G7 assay is used to determinethe residual amylase activity after incubation in the presence of thechelating agent HEDP. In general the residual amylase activity wasdetermined after incubation in a buffer containing a chelating agent ateither pH 8 or pH 10 at the indicated temperatures and incubation timesand the activity is then compared to the activity of a referenceincubated at 4° C. as described above under Materials and Methods.

Test of Stability of Amylase Variants after Incubation with ChelatingAgent at pH8 and pH10 in Buffer

Principle:

Enzyme samples were incubated in buffer pH 8.0 with 1.5% (w/v) finalconcentration of HEDP at indicated temperature and incubation time andreference samples were incubated at 4° C. at same incubation time. Inaddition, enzyme samples were incubated in buffer pH10.0 with 1.5% (w/v)final concentration of HEDP at indicated temperature and incubation timeand their reference samples were incubated at 4° C. at same incubationtime. After incubation the residual activity was determined using thePNP-G7 amylase activity assay.Reagents:pH 8 buffer with HEDP: 50 mM EPPS, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) HEDP (1-Hydroxyethylidenediphosphonic acid, cas no 2809-21-4),pH8.0pH 10 buffer with HEDP: 50 mM Glycine, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) HEDP (1-Hydroxyethylidenediphosphonic acid, cas no 2809-21-4), pH10.0Amylase solutions: 0.25 and 0.5 mg active amylase protein/mL in 5 mMEPPS, 0.01% (w/v) TRITON™ X-100, pH 8.0Procedure:160 μL buffer (pH 8 buffer with HEDP or pH 10 buffer with HEDP) and 40μL of the amylase solutions were transferred to a 96-well PCR microtiterplate in duplicate and the content was mixed for 1 minutes (PCR:Polymerase Chain Reaction). Final concentration of HEDP was 1.5% (w/v)in each well. 20 μl from each well was transferred to a microtiter plate(MTP), which was placed at 4° C. (reference sample). The PCR MTP(stressed sample) was incubated in PCR machine as indicated in table 7.1below. The residual activity was calculated as 100*V_(max)(stressedsample)/V_(max)(reference sample). The percentage point (pp) improvementin the stability of the variants relative to the parent is calculated asthe residual activity of the variant minus the residual activity of theparent.

TABLE 7-1 SP722 + D183* G184* variants with HEDP pH 8, 50° C., 210minutes, pH 10, 42° C., 60 minutes, 1.5% HEDP 1.5% HEDP Residual ppimprovement Residual pp improvement Enzyme activity (%) relative toparent activity (%) relative to parent SP722 + D183* G184* (parent) 16 016 0 SP722 + D183* G184* N195F V206Y 96 80 95 79 Y243F SP722 + D183*G184* S193T V206L 61 45 62 46 SP722 + D183* G184* G133E 82 66 74 58G149R N195Y Y203F V206LThe results clearly shows that the variants of SP722+D183* G184* aremuch more stable when incubated in the presence of HEDP as chelatingagent.

Example 8: Stability of AA560 Variants in the Presence of 1.5% (w/v)DTPA or 1.5% (w/v)

HEDP

In this example the above-described PNP-G7 assay is used to determinethe residual amylase activity after incubation in the presence of thechelating agent DTPA or HEDP. In general the residual amylase activitywas determined after incubation in a buffer containing a chelating agentat either pH 8 or pH 10 at the indicated temperatures and incubationtimes and the activity is then compared to the activity of a referenceincubated at 4° C. as described above under “Materials and Methods”.Test of Stability of Amylase Variants after Incubation with ChelatingAgent at pH8 and pH10 in BufferPrinciple:Enzyme samples were incubated in buffer pH 8.0 with 1.5% (w/v) finalconcentration of DTPA or HEDP at indicated temperature and incubationtime and reference samples were incubated at 4° C. at same incubationtime. In addition, enzyme samples were incubated in buffer pH10.0 with1.5% (w/v) final concentration of DTPA or HEDP at indicated temperatureand incubation time and their reference samples were incubated at 4° C.at same incubation time. After incubation the residual activity wasdetermined using the PNP-G7 amylase activity assay.Reagents:pH 8 buffer with DTPA: 50 mM EPPS, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) DTPA (Diethylene triamine pentaacetic acid, cas no. 67-43-6),pH8.0pH 10 buffer with DTPA: 50 mM Glycine, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) DTPA (Diethylene triamine pentaacetic acid, cas no. 67-43-6), pH10.0pH 8 buffer with HEDP: 50 mM EPPS, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) HEDP (1-Hydroxyethylidenediphosphonic acid, cas no 2809-21-4),pH8.0pH 10 buffer with HEDP: 50 mM Glycine, 0.01% (w/v) TRITON™ X100, 1.875%(w/v) HEDP (1-Hydroxyethylidenediphosphonic acid, cas no 2809-21-4), pH10.0Amylase solutions: 0.25 and 0.5 mg active amylase protein/mL in 5 mMEPPS, 0.01% (w/v) TRITON™ X-100, pH 8.0Procedure:160 μL buffer (pH 8 buffer with DTPA or HEDP or pH 10 buffer with DTPAor HEDP) and 40 μL of the amylase solutions were transferred to a96-well PCR microtiter plate in duplicate and the content was mixed for1 minutes (PCR: Polymerase Chain Reaction). Final concentration of DTPAor HEDP was 1.5% (w/v) in each well. 20 μl from each well wastransferred to a microtiter plate (MTP), which was placed at 4° C.(reference sample). The PCR MTP (stressed sample) was incubated in PCRmachine as indicated in table 8.1 and 8.2 below. The residual activitywas calculated as 100*V_(max)(stressed sample)/V_(max)(referencesample). The percentage point (pp) improvement in the stability of thevariants relative to the parent is calculated as the residual activityof the variant minus the residual activity of the parent.

TABLE 8.1 AA560 variants with DTPA pH 8, 49° C., pH 10, 42° C., 150minutes, 60 minutes, 1.5% DTPA 1.5% DTPA pp pp Residual improvementResidual improvement activity relative activity relative Enzyme (%) toparent (%) to parent AA560 + 118K 20 0 21 0 D183* G184* N195F R320KR458K (parent) Parent + I206L 49 29 45 24 Parent + I206Y 77 57 78 57Parent + Y243F 31 11 36 15

TABLE 8.2 AA560 variants with HEDP pH 8, 50° C., 210 minutes, pH 10, 42°C., 60 minutes, 1.5% HEDP 1.5% HEDP Residual pp improvement Residual ppimprovement Enzyme activity (%) relative to parent activity (%) relativeto parent AA560 + 118K D183* G184* 60 0 19 0 N195F R320K R458K (parent)Parent + I206L 68 8 38 19 Parent + I206Y 85 25 72 53 Parent + Y243F 59−1 34 15Various references are cited herein, the disclosures of which areincorporated by reference in their entireties.

Example 9: Residual Activity after Incubation in Detergent withChelating Agent

In this example the PNP-G7 assay is used to determine the residualamylase activity after incubation in the detergent in the presence ofchelating agents, as described in above under “Materials and Methods”.

In general, the residual amylase activity was determined afterincubation in detergent C (Table 9.1), containing chelating agents DTPMPand HEDP at pH 8.2 after 3 weeks and 6 weeks 30° C. The residualactivity of the amylase is then compared to the activity of the amylasein the freshly made detergent at day zero (before incubation) asdescribed below.

TABLE 9.1 Detergent C Composition of Detergent Detergent C used forstability testing Ingredient Composition (wt % of composition) C_(11.8)Alkylbenzene sulfonate 5.89 Citric acid 2.56 C₁₂₋₁₈ fatty acid 2.56Sodium C₁₂₋₁₄ alkyl ethoxy 3 sulfate 1.96 C₁₄₋₁₅ alkyl-7-ethoxylate 1.94C₁₂₋₁₄ Alkyl-7-ethoxylate 2.21 Boric Acid 0.5 A compound having thefollowing general structure: 1.46 bis((C₂H₅O)(C₂H₄O)n)(CH₃)—N⁺—C_(x)H_(2x)—N⁺—(CH₃)- bis((C₂H₅O)(C₂H₄O)n), wherein n = from 20 to 30,and x = from 3 to 8, or sulphated or sulphonated variants thereof DTPMP(Diethylene triamine penta (methylene phosphonic acid) 0.19 HEDP(Hydroxyethane diphosphonic acid) 1.6 Ethanol 1.95 Propylene Glycol 1.5Monoethanolamine 5.15 Water, Aesthetics (Dyes, perfumes), pH adjusters(sodium Balance to pH 8.2 hydroxide) and Minors (Enzymes, solvents,structurants, brighteners)Test of Stability of Amylase Variants after Incubation in Detergent Cwith Chelating Agents at pH 8.2MethodDetergent C, pH 8.2, samples were prepared each containing an amylasevariant of the invention or the SEQ ID NO: 6 (SP722) with the followingtwo deletions D183* +G184*—also ref to as SP722+D183* G184*. Eachdetergent sample was determined for the initial residual enzyme activitybefore incubation (reference samples).The residual enzyme activity for each sample was determined afterincubation at 30° C. for 3 weeks and 6 weeks and compared to theirreference sample. The residual activity was determined using the PNP-G7amylase activity assay.Amylase solutions: 13.77 mg active amylase protein in 100 g detergent C,pH 8.2Procedure:Detergent C, 5 g pH 8.2 containing the amylase was placed in duplicateinto a 7 ml glass vial with an air tight lid. The residual enzymeactivity was determined for the initial samples, in duplicate, beforeincubation.The samples were placed into an incubator for 3 weeks and 6 weeks at 30°C. Immediately after incubation, the samples were analysed for residualamylase activity as described in PNP-G7 assay. In this test the residualactivity of 100% equals no loss of amylase activity compared to initialresidual enzyme activity before incubation (reference sample). Thepercentage point (pp) improvement in residual activity (stability) ofthe variant relative to the parent is calculated as the differencebetween the residual activity of the variant and the residual activityof the parent.

TABLE 9.2 Residual activity pp improvement in residual pH 8.2, 30° C.activity relative to parent 3 Weeks 6 Weeks 3 Weeks 6 Weeks SP722 +D183* G184* (parent) 19 3 SP722 + D183* G184* N195F 67 47 48 44 SP722 +D183* G184* N195F H210Y 82 78 63 75 SP722 + D183* G184* N195F V206L 8783 68 80 SP722 + D183* G184* N195F V206Y 98 97 79 94 SP722 + D183* G184*N195F V206Y 100 97 81 94 Y243FThe results clearly show that the variants of the invention are highlystable and have high residual activity after incubation in detergent Cat pH 8.2, 3 weeks and 6 weeks 30° C. In comparison SP722+D183* G184*amylase has 19% after 3 weeks and 3% after 6 weeks residual activity.

Various references are cited herein, the disclosures of which areincorporated by reference in their entireties.

The dimensions and values disclosed herein are not to be understood asbeing strictly limited to the exact numerical values recited. Instead,unless otherwise specified, each such dimension is intended to mean boththe recited value and a functionally equivalent range surrounding thatvalue. For example, a dimension disclosed as “40 mm” is intended to mean“about 40 mm”.

The invention described and claimed herein is not to be limited in scopeby the specific embodiments herein disclosed, since these embodimentsare intended as illustrations of several aspects of the invention. Anyequivalent embodiments are intended to be within the scope of thisinvention. Indeed, various modifications of the invention in addition tothose shown and described herein will become apparent to those skilledin the art from the foregoing description. Such modifications are alsointended to fall within the scope of the appended claims. In the case ofconflict, the present disclosure including definitions will control.

The invention claimed is:
 1. A variant of a parent alpha-amylase comprising alterations corresponding to positions 206 and 243 of SEQ ID NO: 10, wherein the variant has alpha-amylase activity and at least 95% sequence identity to SEQ ID NO:
 10. 2. The variant of claim 1, wherein the alteration is independently: (i) an insertion of an amino acid immediately downstream and adjacent of the position, (ii) a deletion of the amino acid which occupies the position, and/or (iii) a substitution of the amino acid which occupies the position.
 3. The variant of claim 2, wherein the variant comprises a substitution at position 206 selected from the group consisting of F, W, Y, N, L, I, V, H, Q, D and E.
 4. The variant of claim 2, wherein the variant comprises a substitution at position 243 selected from the group consisting of F, W, Y, L, I and V.
 5. The variant of claim 1, wherein the variant further comprises an alteration at one or more positions corresponding to a position of SEQ ID NO: 10 selected from the group consisting of 116, 118, 129, 133, 142, 146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434, 447 and
 458. 6. The variant of claim 1, wherein the variant further comprises at least one, at least two, or at least three deletions in the amino acid region of positions 181, 182, 183 or 184, as set forth in SEQ ID NO:
 10. 7. The variant of claim 6, comprising deletions in amino acid positions 183 and
 184. 8. The variant of claim 1, wherein the variant having alpha-amylase activity has an amino acid sequence having at least 98% sequence identity with the mature polypeptide of SEQ ID NO:
 10. 9. The variant of claim 1, wherein the variant has improved stability relative to the parent alpha-amylase in a composition comprising a chelating agent, and wherein said chelating agent at a concentration below 10 mM reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM at 21° C. and pH 8.0.
 10. The variant of claim 1, wherein the variant has at least 60% residual activity after 18 hours at pH 8 in the presence of a chelating agent, and wherein said chelating agent at a concentration below 10 mM reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM at 21° C. and pH 8.0.
 11. The variant of claim 1, wherein the variant has improved wash performance compared to the parent alpha-amylase when measured in an Automated Mechanical Wash Assay.
 12. A composition comprising a variant of a parent alpha-amylase, wherein the variant comprises alterations corresponding to positions 206 and 243 of SEQ ID NO: 10 and further comprising at least one chelating agent, wherein said chelating agent at a concentration below 10 mM reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM when measured at 21° C. and pH 8.0, and wherein the variant has alpha-amylase activity and at least 95% sequence identity to SEQ ID NO:
 10. 13. The composition of claim 12, wherein the chelating agent at a concentration below 10 mM reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM when measured in 80 mM potassium chloride and 49 mM EPPS at 21° C. and pH 8.0.
 14. The composition of claim 12, wherein the chelating agent at a concentration below 10 mM reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM.
 15. The composition of claim 12, wherein the chelating agent reduces the concentration of free calcium ions from 2.0 mM to 0.10 mM at a chelator agent concentration below 8 mM.
 16. The composition of claim 12, wherein the chelating agent reduces the free calcium ion concentration from 2.0 mM to 0.10 mM at a chelating agent concentration below 0.9 times the concentration of citrate that reduces the free calcium ion concentration from 2.0 mM to 0.10 mM.
 17. The composition of claim 12, wherein the chelating agent is selected from the group consisting of: ethylenediaminetetraacetic acid (EDTA), methylgycinediacetic acid (MGDA), ethylene glucol-bis(beta-aminoethyl ether)-N, N, N′, N′-tetraacetic acid (EGTA), diethylenetriaminepentaacetic acid (DTPA), diethylenetriamine penta(methylene phosphonic acid) (DTPMP) and 1-hydroxyethane 1,1-diphosphic acid (HEDP).
 18. The composition of claim 12, wherein the variant comprises a substitution at position 206 selected from the group consisting of F, W, Y, N, L, I, V, H, Q, D and E.
 19. The composition of claim 12, wherein the variant comprises a substitution at position 243 selected from the group consisting of F, W, Y, L, I and V.
 20. The composition of claim 12, wherein the variant comprises substitutions at positions 206 and
 243. 21. The variant of claim 12, wherein the variant further comprises an alteration at one or more positions corresponding to a position of SEQ ID NO: 10 selected from the group consisting of 116, 118, 129, 133, 142, 146, 147, 149, 151, 152, 169, 174, 186, 235, 244, 303, 320, 339, 359, 418, 431, 434, 447 and
 458. 22. The variant of claim 12, wherein the variant further comprises at least one, at least two, or at least three deletions in the amino acid region of positions 181, 182, 183, or 184, as set forth in SEQ ID NO:
 10. 23. The variant of claim 22, comprising deletions in amino acid positions 183 and
 184. 